1. What is the main focus of Chapter 3: Materials: Metals and Non-Metals?
The main focus of Chapter 3 is to understand the properties, uses, and reactions of metals and non-metals.
2. What are metals?
Metals are shiny, hard, and good conductors of heat and electricity.
3. What are non-metals?
Non-metals are dull, brittle, and poor conductors of heat and electricity.
4. What is an element?
An element is a pure substance that cannot be broken down into simpler substances.
5. How many elements are known?
More than 100 elements are known, with around 118 identified.
6. How many elements are metals?
About 80% of known elements are metals.
7. How many elements are non-metals?
About 20% of known elements are non-metals.
8. What is a metalloid?
A metalloid is an element with properties of both metals and non-metals.
9. Give an example of a metal.
An example of a metal is iron.
10. Give an example of a non-metal.
An example of a non-metal is oxygen.
11. Give an example of a metalloid.
An example of a metalloid is silicon.
12. What is the physical property of metals related to shine?
Metals have a shiny surface called lustre.
13. What is the physical property of non-metals related to shine?
Non-metals are generally dull and lack lustre.
14. What is the property of metals related to hardness?
Metals are generally hard and strong.
15. What is the property of non-metals related to hardness?
Non-metals are generally soft and brittle.
16. What is malleability?
Malleability is the ability of metals to be beaten into thin sheets.
17. What is ductility?
Ductility is the ability of metals to be drawn into thin wires.
18. Are non-metals malleable?
No, non-metals are not malleable; they are brittle.
19. Are non-metals ductile?
No, non-metals are not ductile; they cannot be drawn into wires.
20. Give an example of a malleable metal.
An example of a malleable metal is gold.
21. Give an example of a ductile metal.
An example of a ductile metal is copper.
22. What is the property of metals related to heat conduction?
Metals are good conductors of heat.
23. What is the property of non-metals related to heat conduction?
Non-metals are poor conductors of heat.
24. What is the property of metals related to electricity?
Metals are good conductors of electricity.
25. What is the property of non-metals related to electricity?
Non-metals are poor conductors of electricity.
26. Give an example of a non-metal that conducts electricity.
An example of a non-metal that conducts electricity is graphite.
27. What is the property of metals related to sound?
Metals produce a ringing sound when struck, called sonority.
28. Are non-metals sonorous?
No, non-metals are not sonorous; they do not produce a ringing sound.
29. What is the state of most metals at room temperature?
Most metals are solid at room temperature.
30. What is the state of most non-metals at room temperature?
Non-metals can be solid, liquid, or gas at room temperature.
31. Give an example of a liquid metal.
An example of a liquid metal is mercury.
32. Give an example of a liquid non-metal.
An example of a liquid non-metal is bromine.
33. Give an example of a gaseous non-metal.
An example of a gaseous non-metal is oxygen.
34. What is the density of metals?
Metals generally have high density.
35. What is the density of non-metals?
Non-metals generally have low density.
36. Give an example of a low-density metal.
An example of a low-density metal is sodium.
37. What is the melting point of metals?
Metals generally have high melting points.
38. What is the melting point of non-metals?
Non-metals generally have low melting points.
39. Give an example of a metal with a low melting point.
An example of a metal with a low melting point is sodium.
40. What is the boiling point of metals?
Metals generally have high boiling points.
41. What is the boiling point of non-metals?
Non-metals generally have low boiling points.
42. What is the chemical property of metals related to oxygen?
Metals react with oxygen to form metal oxides.
43. What is the chemical property of non-metals related to oxygen?
Non-metals react with oxygen to form non-metal oxides.
44. What is the nature of metal oxides?
Metal oxides are generally basic in nature.
45. What is the nature of non-metal oxides?
Non-metal oxides are generally acidic in nature.
46. Give an example of a metal oxide.
An example of a metal oxide is sodium oxide.
47. Give an example of a non-metal oxide.
An example of a non-metal oxide is carbon dioxide.
48. What happens when metals react with water?
Some metals react with water to form metal hydroxides and hydrogen gas.
49. What happens when non-metals react with water?
Non-metals generally do not react with water.
50. Give an example of a metal that reacts with cold water.
An example of a metal that reacts with cold water is sodium.
51. What happens when sodium reacts with water?
Sodium reacts with water to form sodium hydroxide and hydrogen gas.
52. What happens when iron reacts with water?
Iron reacts with steam to form iron oxide and hydrogen gas.
53. What happens when metals react with acids?
Metals react with acids to form salt and hydrogen gas.
54. What happens when non-metals react with acids?
Non-metals generally do not react with acids.
55. Give an example of a metal that reacts with dilute acid.
An example of a metal that reacts with dilute acid is zinc.
56. What is produced when zinc reacts with hydrochloric acid?
Zinc reacts with hydrochloric acid to produce zinc chloride and hydrogen gas.
57. What is a displacement reaction?
A displacement reaction is when a more reactive metal displaces a less reactive metal from its compound.
58. Give an example of a displacement reaction.
An example is iron displacing copper from copper sulphate to form iron sulphate.
59. What is the reactivity series?
The reactivity series is a list of metals arranged in order of their reactivity.
60. Which metal is the most reactive in the reactivity series?
Potassium is the most reactive metal in the reactivity series.
61. Which metal is the least reactive in the reactivity series?
Gold is the least reactive metal in the reactivity series.
62. What is the order of metals in the reactivity series?
The order is potassium, sodium, calcium, magnesium, aluminium, zinc, iron, lead, copper, silver, gold.
63. Why do some metals displace others?
Some metals displace others because they are more reactive and can replace less reactive metals.
64. What happens when copper is placed in iron sulphate solution?
Copper does not displace iron from iron sulphate because copper is less reactive.
65. What happens when iron is placed in copper sulphate solution?
Iron displaces copper from copper sulphate to form iron sulphate and copper.
66. What is the use of the reactivity series?
The reactivity series helps predict whether a metal can displace another in a reaction.
67. What is corrosion?
Corrosion is the gradual destruction of metals due to reaction with the environment.
68. What is rust?
Rust is the corrosion of iron when it reacts with oxygen and moisture.
69. What is the chemical formula of rust?
The chemical formula of rust is Fe₂O₃·nH₂O.
70. What conditions are needed for rusting?
Rusting requires the presence of oxygen and moisture.
71. How can rusting be prevented?
Rusting can be prevented by painting, oiling, or galvanizing iron.
72. What is galvanization?
Galvanization is coating iron with zinc to prevent rusting.
73. What is alloying?
Alloying is mixing a metal with other elements to improve its properties.
74. What is an alloy?
An alloy is a mixture of two or more metals or a metal and a non-metal.
75. Give an example of an alloy.
An example of an alloy is stainless steel.
76. What is stainless steel made of?
Stainless steel is made of iron, chromium, and nickel.
77. What is brass made of?
Brass is made of copper and zinc.
78. What is bronze made of?
Bronze is made of copper and tin.
79. Why are alloys used?
Alloys are used because they are stronger and more resistant to corrosion than pure metals.
80. What is the use of iron in daily life?
Iron is used in daily life for making tools, machines, and bridges.
81. What is the use of copper in daily life?
Copper is used in daily life for making electrical wires and pipes.
82. What is the use of aluminium in daily life?
Aluminium is used in daily life for making utensils and aircraft parts.
83. What is the use of gold in daily life?
Gold is used in daily life for making jewellery and coins.
84. What is the use of silver in daily life?
Silver is used in daily life for making jewellery and mirrors.
85. What is the use of oxygen in daily life?
Oxygen is used in daily life for breathing and in hospitals.
86. What is the use of nitrogen in daily life?
Nitrogen is used in daily life for making fertilizers and preserving food.
87. What is the use of carbon in daily life?
Carbon is used in daily life as fuel and in pencils as graphite.
88. What is the use of sulphur in daily life?
Sulphur is used in daily life for making gunpowder and medicines.
89. What is the use of phosphorus in daily life?
Phosphorus is used in daily life for making matches and fertilizers.
90. Why is gold used in jewellery?
Gold is used in jewellery because it is shiny and does not corrode.
91. Why is copper used in wires?
Copper is used in wires because it is a good conductor of electricity.
92. Why is aluminium used in foil?
Aluminium is used in foil because it is lightweight and malleable.
93. Why is iron used in construction?
Iron is used in construction because it is strong and durable.
94. Why is oxygen essential for life?
Oxygen is essential for life because it is needed for respiration.
95. Why is nitrogen used in fertilizers?
Nitrogen is used in fertilizers because it helps plants grow.
96. What is the physical state of mercury at room temperature?
Mercury is a liquid at room temperature.
97. What is the physical state of bromine at room temperature?
Bromine is a liquid at room temperature.
98. What is the physical state of sulphur at room temperature?
Sulphur is a solid at room temperature.
99. What is the physical state of oxygen at room temperature?
Oxygen is a gas at room temperature.
100. What is the colour of copper?
The colour of copper is reddish-brown.
101. What is the colour of sulphur?
The colour of sulphur is yellow.
102. What is the colour of gold?
The colour of gold is yellow.
103. What is the colour of carbon as graphite?
The colour of carbon as graphite is black.
104. What is the colour of oxygen?
Oxygen is a colourless gas.
105. Why do metals have high density?
Metals have high density because their atoms are tightly packed.
106. Why do non-metals have low density?
Non-metals have low density because their atoms are loosely packed.
107. What is the use of zinc in daily life?
Zinc is used in daily life for galvanizing iron and making batteries.
108. What is the use of magnesium in daily life?
Magnesium is used in daily life for making fireworks and lightweight alloys.
109. What is the use of lead in daily life?
Lead is used in daily life for making batteries and pipes.
110. Why is stainless steel used in utensils?
Stainless steel is used in utensils because it is resistant to rust.
111. Why is brass used in musical instruments?
Brass is used in musical instruments because it is durable and sonorous.
112. Why is bronze used in statues?
Bronze is used in statues because it is strong and resists corrosion.
113. What is the use of silicon in daily life?
Silicon is used in daily life for making computer chips and glass.
114. What is the use of chlorine in daily life?
Chlorine is used in daily life for disinfecting water and making bleach.
115. What happens when metals react with oxygen?
116. What happens when magnesium burns in air?
Magnesium burns in air to form magnesium oxide and a bright light.
117. What happens when sulphur burns in air?
Sulphur burns in air to form sulphur dioxide gas.
118. What is the smell of sulphur dioxide?
Sulphur dioxide has a pungent, choking smell.
119. What happens when carbon burns in air?
Carbon burns in air to form carbon dioxide gas.
120. What is the nature of magnesium oxide?
Magnesium oxide is basic in nature.
121. What is the nature of sulphur dioxide?
Sulphur dioxide is acidic in nature.
122. What happens when metal oxides dissolve in water?
Metal oxides dissolve in water to form basic solutions.
123. What happens when non-metal oxides dissolve in water?
Non-metal oxides dissolve in water to form acidic solutions.
124. What is formed when sodium oxide dissolves in water?
Sodium oxide dissolves in water to form sodium hydroxide.
125. What is formed when carbon dioxide dissolves in water?
Carbon dioxide dissolves in water to form carbonic acid.
126. Why do some metals not react with water?
Some metals do not react with water because they are less reactive.
127. Give an example of a metal that does not react with water.
An example of a metal that does not react with water is gold.
128. What happens when calcium reacts with water?
Calcium reacts with water to form calcium hydroxide and hydrogen gas.
129. What happens when aluminium reacts with steam?
Aluminium reacts with steam to form aluminium oxide and hydrogen gas.
130. What is the use of hydrogen gas?
Hydrogen gas is used as a fuel and in making ammonia.
131. Why do some metals react vigorously with acids?
Some metals react vigorously with acids because they are highly reactive.
132. What is produced when magnesium reacts with hydrochloric acid?
Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas.
133. What is produced when iron reacts with sulphuric acid?
Iron reacts with sulphuric acid to produce iron sulphate and hydrogen gas.
134. Why do gold and silver not react with acids?
Gold and silver do not react with acids because they are less reactive.
135. What is an acid?
An acid is a substance that produces hydrogen ions in water and tastes sour.
136. What is a base?
A base is a substance that produces hydroxide ions in water and feels slippery.
137. What is a salt?
A salt is a compound formed when a metal reacts with an acid.
138. What is the test for hydrogen gas?
The test for hydrogen gas is that it burns with a pop sound.
139. What happens in a displacement reaction involving zinc and copper sulphate?
Zinc displaces copper from copper sulphate to form zinc sulphate and copper.
140. Why does zinc displace copper?
Zinc displaces copper because zinc is more reactive than copper.
141. What happens when silver is placed in zinc sulphate solution?
Silver does not displace zinc from zinc sulphate because silver is less reactive.
142. What is the use of aluminium in aircraft?
Aluminium is used in aircraft because it is lightweight and strong.
143. What is the use of mercury in thermometers?
Mercury is used in thermometers because it expands uniformly with temperature.
144. What is the use of graphite in pencils?
Graphite is used in pencils because it leaves marks on paper.
145. What is the use of diamond?
Diamond is used for cutting tools and jewellery due to its hardness and shine.
146. Why is diamond a non-metal?
Diamond is a non-metal because it is a form of carbon and lacks metallic properties.
147. What is the hardest substance known?
The hardest substance known is diamond.
148. Why is iron prone to rusting?
Iron is prone to rusting because it reacts with oxygen and moisture.
149. How does painting prevent rusting?
Painting prevents rusting by forming a barrier against oxygen and moisture.
150. How does oiling prevent rusting?
Oiling prevents rusting by keeping moisture away from the metal surface.
151. What is anodizing?
Anodizing is coating aluminium with a protective oxide layer to prevent corrosion.
152. Why is gold less reactive?
Gold is less reactive because it has a stable electron configuration.
153. Why is sodium highly reactive?
Sodium is highly reactive because it easily loses an electron.
154. What is the use of sodium in daily life?
Sodium is used in daily life in sodium lamps and as a component of salt.
155. What is the use of potassium in daily life?
Potassium is used in daily life in fertilizers and for body functions.
156. What is the use of calcium in daily life?
Calcium is used in daily life for making cement and in bones.
157. What is the use of tin in daily life?
Tin is used in daily life for coating cans to prevent corrosion.
158. What is the use of iodine in daily life?
Iodine is used in daily life as an antiseptic and in thyroid function.
159. Why is tungsten used in bulbs?
Tungsten is used in bulbs because it has a high melting point.
160. What is the use of platinum in daily life?
Platinum is used in daily life in jewellery and catalytic converters.
161. What is the use of helium in daily life?
Helium is used in daily life for filling balloons and in medical imaging.
162. Why is helium a non-metal?
Helium is a non-metal because it is a gas and lacks metallic properties.
163. What is the use of neon in daily life?
Neon is used in daily life for making neon signs and lights.
164. What is the use of argon in daily life?
Argon is used in daily life for filling light bulbs and welding.
165. Why are noble gases non-reactive?
Noble gases are non-reactive because they have a stable electron configuration.
166. What is the use of metals in construction?
Metals are used in construction for their strength and durability.
167. What is the use of non-metals in medicines?
Non-metals like iodine are used in medicines as antiseptics.
168. What is the use of metals in transport?
Metals like aluminium and steel are used in transport for making vehicles.
169. What is the use of non-metals in agriculture?
Non-metals like nitrogen and phosphorus are used in agriculture for fertilizers.
170. What is the use of metals in electronics?
Metals like copper and gold are used in electronics for wiring and circuits.
171. What is the use of non-metals in electronics?
Non-metals like silicon are used in electronics for making chips.
172. Why is silver used in mirrors?
Silver is used in mirrors because it reflects light well.
173. Why is lead used in batteries?
Lead is used in batteries because it supports chemical reactions for energy.
174. What is the use of metals in coins?
Metals like copper and nickel are used in coins for their durability.
175. What is the use of non-metals in fuels?
Non-metals like carbon are used in fuels like coal and petrol.
176. Why is titanium used in implants?
Titanium is used in implants because it is strong and does not corrode in the body.
177. What is the use of chromium in daily life?
Chromium is used in daily life for making stainless steel and plating.
178. What is the use of nickel in daily life?
Nickel is used in daily life for making coins and stainless steel.
179. Why is magnesium used in flares?
Magnesium is used in flares because it burns with a bright white light.
180. What is the use of boron in daily life?
Boron is used in daily life for making glass and detergents.
181. Why is carbon important for life?
Carbon is important for life because it forms the basis of organic compounds.
182. What is the use of fluorine in daily life?
Fluorine is used in daily life in toothpaste to prevent tooth decay.
183. Why is sodium stored in kerosene?
Sodium is stored in kerosene to prevent it from reacting with air or water.
184. Why is phosphorus stored in water?
Phosphorus is stored in water to prevent it from catching fire in air.
185. What is the use of metals in utensils?
Metals like stainless steel are used in utensils for their strength and hygiene.
186. What is the use of non-metals in tyres?
Non-metals like carbon are used in tyres for strength and durability.
187. Why is aluminium used in packaging?
Aluminium is used in packaging because it is lightweight and corrosion-resistant.
188. What is the use of metals in jewellery?
Metals like gold and silver are used in jewellery for their shine and value.
189. What is the use of non-metals in explosives?
Non-metals like sulphur are used in explosives like gunpowder.
190. Why is iron used in magnets?
Iron is used in magnets because it has magnetic properties.
191. What is the use of cobalt in daily life?
Cobalt is used in daily life for making magnets and batteries.
192. What is the use of manganese in daily life?
Manganese is used in daily life for making steel and batteries.
193. Why is zinc used in galvanization?
Zinc is used in galvanization because it prevents iron from rusting.
194. What is the use of metals in tools?
Metals like iron and steel are used in tools for their strength.
195. What is the use of non-metals in plastics?
Non-metals like carbon are used in plastics as part of their structure.
196. Why is copper used in coins?
Copper is used in coins because it is durable and resistant to corrosion.
197. What is the use of metals in bridges?
Metals like steel are used in bridges for their strength and flexibility.
198. What is the use of non-metals in paints?
Non-metals like carbon are used in paints as pigments.
199. Why is aluminium used in window frames?
Aluminium is used in window frames because it is lightweight and corrosion-resistant.
200. What is the use of metals in railways?
Metals like steel are used in railways for tracks and trains.
201. What is the use of non-metals in insulation?
Non-metals like sulphur are used in insulation for electrical purposes.
202. Why is silver used in photography?
Silver is used in photography because it is sensitive to light.
203. What is the use of metals in ships?
Metals like steel are used in ships for their strength and durability.
204. What is the use of non-metals in batteries?
Non-metals like carbon are used in batteries as electrodes.
205. Why is iron used in vehicles?
Iron is used in vehicles because it is strong and affordable.
206. What is the use of metals in cables?
Metals like copper are used in cables for conducting electricity.
207. What is the use of non-metals in ceramics?
Non-metals like silicon are used in ceramics for their hardness.
208. Why is gold used in electronics?
Gold is used in electronics because it is a good conductor and does not corrode.
209. What is the use of metals in pipelines?
Metals like steel are used in pipelines for their strength and durability.
210. What is the use of non-metals in glass?
Non-metals like silicon are used in glass for its structure.
211. Why is titanium used in aerospace?
Titanium is used in aerospace because it is strong and lightweight.
212. What is the use of metals in engines?
Metals like steel are used in engines for their durability and heat resistance.
213. What is the use of non-metals in fireworks?
Non-metals like sulphur are used in fireworks for combustion.
214. Why is copper used in plumbing?
Copper is used in plumbing because it is corrosion-resistant and durable.
215. What is the use of metals in furniture?
Metals like aluminium are used in furniture for strength and light weight.
216. What is the use of non-metals in rubber?
Non-metals like carbon are used in rubber for reinforcement.
217. Why is steel used in buildings?
Steel is used in buildings because it is strong and flexible.
218. What is the use of metals in surgical tools?
Metals like stainless steel are used in surgical tools for their hygiene and strength.
219. What is the use of non-metals in matches?
Non-metals like phosphorus are used in matches for ignition.
220. Why is aluminium used in cans?
Aluminium is used in cans because it is lightweight and recyclable.
221. What is the use of metals in ornaments?
Metals like gold are used in ornaments for their beauty and value.
222. What is the use of non-metals in dyes?
Non-metals like carbon are used in dyes for colour.
223. Why is iron used in railings?
Iron is used in railings because it is strong and durable.
224. What is the use of metals in weapons?
Metals like steel are used in weapons for their strength and sharpness.
225. What is the use of non-metals in cement?
Non-metals like silicon are used in cement for binding properties.
226. Why is copper used in statues?
Copper is used in statues because it is durable and forms a protective patina.
227. What is the use of metals in clocks?
Metals like brass are used in clocks for their durability and shine.
228. What is the use of non-metals in adhesives?
Non-metals like carbon are used in adhesives for their bonding properties.
229. Why is zinc used in batteries?
Zinc is used in batteries because it supports chemical reactions for energy.
230. What is the use of metals in turbines?
Metals like steel are used in turbines for their strength and heat resistance.
231. What is the use of non-metals in lubricants?
Non-metals like graphite are used in lubricants for their slippery nature.
232. Why is aluminium used in ladders?
Aluminium is used in ladders because it is lightweight and strong.
233. What is the use of metals in bells?
Metals like bronze are used in bells for their sonorous property.
234. What is the use of non-metals in soaps?
Non-metals like carbon are used in soaps for their chemical structure.
235. Why is iron used in anchors?
Iron is used in anchors because it is heavy and strong.
236. What is the use of metals in locks?
Metals like brass are used in locks for their durability and strength.
237. What is the use of non-metals in perfumes?
Non-metals like carbon are used in perfumes for their chemical compounds.
238. Why is steel used in knives?
Steel is used in knives because it is sharp and durable.
239. What is the use of metals in cranes?
Metals like steel are used in cranes for their strength and load-bearing capacity.
240. What is the use of non-metals in textiles?
Non-metals like carbon are used in textiles for synthetic fibres.
241. Why is copper used in lightning conductors?
Copper is used in lightning conductors because it conducts electricity well.
242. What is the use of metals in gears?
Metals like steel are used in gears for their strength and durability.
243. What is the use of non-metals in antiseptics?
Non-metals like iodine are used in antiseptics for their germ-killing properties.
244. Why is aluminium used in satellites?
Aluminium is used in satellites because it is lightweight and corrosion-resistant.
245. What is the use of metals in radiators?
Metals like copper are used in radiators for their heat conductivity.
246. What is the use of non-metals in cosmetics?
Non-metals like carbon are used in cosmetics for their compounds.
247. Why is iron used in chains?
Iron is used in chains because it is strong and durable.
248. What is the use of metals in bolts?
Metals like steel are used in bolts for their strength and reliability.
249. What is the use of non-metals in inks?
Non-metals like carbon are used in inks for their colour and stability.
250. Why is brass used in fittings?
Brass is used in fittings because it is corrosion-resistant and durable.
251. What is the use of metals in screws?
Metals like steel are used in screws for their strength and threading.
252. What is the use of non-metals in paper?
Non-metals like carbon are used in paper for chemical processing.
253. Why is stainless steel used in sinks?
Stainless steel is used in sinks because it is rust-resistant and hygienic.
254. What is the use of metals in hinges?
Metals like steel are used in hinges for their strength and durability.
255. What is the use of non-metals in candles?
Non-metals like carbon are used in candles for their wax structure.
256. Why is copper used in heat exchangers?
Copper is used in heat exchangers because it conducts heat well.
257. What is the use of metals in springs?
Metals like steel are used in springs for their elasticity and strength.
258. What is the use of non-metals in detergents?
Non-metals like boron are used in detergents for cleaning properties.
259. Why is aluminium used in reflectors?
Aluminium is used in reflectors because it reflects light well.
260. What is the use of metals in bearings?
Metals like steel are used in bearings for their strength and smoothness.
261. What is the use of non-metals in fertilizers?
Non-metals like nitrogen are used in fertilizers for plant growth.
262. Why is iron used in hammers?
Iron is used in hammers because it is hard and strong.
263. What is the use of metals in wires?
Metals like copper are used in wires for their conductivity.
264. What is the use of non-metals in bleaching?
Non-metals like chlorine are used in bleaching for whitening.
265. Why is steel used in rails?
Steel is used in rails because it is strong and wear-resistant.
266. What is the use of metals in frames?
Metals like aluminium are used in frames for their strength and light weight.
267. What is the use of non-metals in matches?
268. Why is copper used in pots?
Copper is used in pots because it conducts heat evenly.
269. What is the use of metals in nails?
Metals like steel are used in nails for their strength and durability.
270. What is the use of non-metals in pesticides?
Non-metals like sulphur are used in pesticides for pest control.
271. Why is aluminium used in boats?
Aluminium is used in boats because it is lightweight and corrosion-resistant.
272. What is the use of metals in pipes?
Metals like copper are used in pipes for their durability and conductivity.
273. What is the use of non-metals in explosives?
Non-metals like sulphur are used in explosives for combustion.
274. Why is iron used in grills?
Iron is used in grills because it is strong and heat-resistant.
275. What is the use of metals in valves?
Metals like steel are used in valves for their strength and durability.
276. What is the use of non-metals in disinfectants?
Non-metals like chlorine are used in disinfectants for killing germs.
277. Why is brass used in taps?
Brass is used in taps because it is corrosion-resistant and durable.
278. What is the use of metals in coins?
Metals like nickel are used in coins for their durability and shine.
279. What is the use of non-metals in rubber?
Non-metals like sulphur are used in rubber for vulcanization.
280. Why is steel used in ships?
Steel is used in ships because it is strong and withstands water.
281. What is the use of metals in turbines?
282. What is the use of non-metals in plastics?
Non-metals like carbon are used in plastics for their structure.
283. Why is aluminium used in utensils?
Aluminium is used in utensils because it is lightweight and conducts heat.
284. What is the use of metals in machinery?
Metals like iron are used in machinery for their strength and durability.
285. What is the use of non-metals in paints?
Non-metals like carbon are used in paints for pigments.
286. Why is copper used in motors?
Copper is used in motors because it conducts electricity well.
287. What is the use of metals in tools?
Metals like steel are used in tools for their hardness and strength.
288. What is the use of non-metals in tyres?
Non-metals like carbon are used in tyres for reinforcement.
289. Why is iron used in girders?
Iron is used in girders because it is strong and supports heavy loads.
290. What is the use of metals in jewellery?
Metals like gold are used in jewellery for their beauty and durability.
291. What is the use of non-metals in soaps?
292. Why is stainless steel used in cutlery?
Stainless steel is used in cutlery because it is rust-resistant and durable.
293. What is the use of metals in wires?
Metals like copper are used in wires for their electrical conductivity.
294. What is the use of non-metals in fertilizers?
Non-metals like phosphorus are used in fertilizers for plant growth.
295. Why is aluminium used in cables?
Aluminium is used in cables because it is lightweight and conducts electricity.
296. What is the use of metals in vehicles?
Metals like steel are used in vehicles for their strength and safety.
297. What is the use of non-metals in glass?
Non-metals like silicon are used in glass for its structure and clarity.
298. Why is iron used in pillars?
Iron is used in pillars because it is strong and supports weight.
299. What is the use of metals in containers?
Metals like aluminium are used in containers for their durability and light weight.
300. What is the use of non-metals in cement?
301. Why is copper used in radiators?
Copper is used in radiators because it conducts heat efficiently.
302. What is the use of metals in frames?
Metals like steel are used in frames for their strength and rigidity.
303. What is the use of non-metals in dyes?
Non-metals like carbon are used in dyes for their colour properties.
304. Why is brass used in door handles?
Brass is used in door handles because it is durable and corrosion-resistant.
305. What is the use of metals in bolts?
306. What is the use of non-metals in inks?
307. Why is stainless steel used in pipes?
Stainless steel is used in pipes because it resists rust and is durable.
308. What is the use of metals in hinges?
309. What is the use of non-metals in candles?
310. Why is aluminium used in foil?
Aluminium is used in foil because it is malleable and lightweight.
311. What is the use of metals in screws?
312. What is the use of non-metals in perfumes?
313. Why is iron used in gates?
Iron is used in gates because it is strong and durable.
314. What is the use of metals in valves?
Metals like brass are used in valves for their durability and corrosion resistance.
315. What is the use of non-metals in disinfectants?
316. Why is steel used in bridges?
Steel is used in bridges because it is strong and flexible.
317. What is the use of metals in coins?
Metals like copper are used in coins for their durability and value.
318. What is the use of non-metals in rubber?
319. Why is copper used in wires?
Copper is used in wires because it is an excellent conductor of electricity.
320. What is the use of metals in tools?
321. What is the use of non-metals in paints?
Non-metals like carbon are used in paints for their pigments.
322. Why is aluminium used in aircraft?
323. What is the use of metals in utensils?
Metals like stainless steel are used in utensils for their durability and hygiene.
324. What is the use of non-metals in fertilizers?
325. Why is iron used in construction?
Iron is used in construction because it is strong and affordable.
326. What is the use of metals in machinery?
Metals like steel are used in machinery for their strength and durability.
327. What is the use of non-metals in glass?
328. Why is gold used in jewellery?
329. What is the use of metals in electronics?
Metals like copper are used in electronics for their conductivity.
330. What is the use of non-metals in tyres?
Non-metals like carbon are used in tyres for reinforcement and durability.
331. Why is stainless steel used in surgical tools?
Stainless steel is used in surgical tools because it is rust-resistant and hygienic.
332. What is the use of metals in vehicles?
333. What is the use of non-metals in plastics?
Non-metals like carbon are used in plastics for their chemical structure.
334. Why is copper used in pipes?
Copper is used in pipes because it is corrosion-resistant and conducts heat well.
335. What is the use of metals in cables?
Metals like aluminium are used in cables for their electrical conductivity.
336. What is the use of non-metals in cement?
337. Why is iron used in magnets?
338. What is the use of metals in coins?
339. What is the use of non-metals in dyes?
340. Why is aluminium used in packaging?
Aluminium is used in packaging because it is lightweight and recyclable.
341. What is the use of metals in bridges?
342. What is the use of non-metals in paints?
Non-metals like carbon are used in paints for their pigments and stability.
343. Why is brass used in musical instruments?
Brass is used in musical instruments because it is sonorous and durable.
344. What is the use of metals in tools?
345. What is the use of non-metals in rubber?
Non-metals like sulphur are used in rubber for vulcanization and strength.
346. Why is steel used in buildings?
Steel is used in buildings because it is strong and can bear heavy loads.
347. What is the use of metals in wires?
Metals like copper are used in wires for their excellent conductivity.
348. What is the use of non-metals in fertilizers?
Non-metals like phosphorus are used in fertilizers to promote plant growth.
349. Why is aluminium used in foil?
Aluminium is used in foil because it is malleable and protects food.
350. What is the use of metals in utensils?
Metals like stainless steel are used in utensils for their durability and ease of cleaning.
351. What is the use of non-metals in glass?
Non-metals like silicon are used in glass for its clarity and strength.
352. Why is iron used in railings?
Iron is used in railings because it is strong and provides safety.
353. What is the use of metals in machinery?
Metals like steel are used in machinery for their strength and reliability.
354. What is the use of non-metals in paints?
Non-metals like carbon are used in paints for their colour and durability.
355. Why is copper used in electrical appliances?
Copper is used in electrical appliances because it conducts electricity efficiently.
356. What is the use of metals in vehicles?
Metals like aluminium are used in vehicles for their strength and light weight.
357. What is the use of non-metals in tyres?
Non-metals like carbon are used in tyres for their strength and grip.
358. Why is stainless steel used in sinks?
Stainless steel is used in sinks because it is rust-resistant and easy to clean.
359. What is the use of metals in coins?
Metals like copper are used in coins for their durability and aesthetic appeal.
360. What is the use of non-metals in plastics?
Non-metals like carbon are used in plastics for their versatility and strength.
361. Why is aluminium used in cans?
362. What is the use of metals in bridges?
Metals like steel are used in bridges for their ability to withstand heavy loads.
363. What is the use of non-metals in fertilizers?
Non-metals like nitrogen are used in fertilizers to enhance soil fertility.
364. Why is iron used in construction?
Iron is used in construction because it is strong and cost-effective.
365. What is the use of metals in electronics?
Metals like gold are used in electronics for their conductivity and reliability.
366. What is the use of non-metals in glass?
Non-metals like silicon are used in glass for its transparency and durability.
367. Why is copper used in pipes?
Copper is used in pipes because it is durable and resistant to corrosion.
368. What is the use of metals in tools?
Metals like steel are used in tools for their hardness and precision.
369. What is the use of non-metals in paints?
Non-metals like carbon are used in paints for their vibrant colours.
370. Why is steel used in vehicles?
Steel is used in vehicles because it is strong and ensures safety.
371. What is the use of metals in jewellery?
Metals like silver are used in jewellery for their shine and malleability.
372. What is the use of non-metals in rubber?
Non-metals like sulphur are used in rubber to improve its elasticity.
373. Why is aluminium used in aircraft?
Aluminium is used in aircraft because it is lightweight and corrosion-resistant.
374. What is the use of metals in utensils?
375. What is the use of non-metals in tyres?
Non-metals like carbon are used in tyres for their durability and traction.
376. Why is iron used in magnets?
Iron is used in magnets because it has strong magnetic properties.
377. What is the use of metals in wires?
Metals like copper are used in wires for their excellent electrical conductivity.
378. What is the use of non-metals in fertilizers?
Non-metals like phosphorus are used in fertilizers to support plant growth.
379. Why is stainless steel used in cutlery?
Stainless steel is used in cutlery because it is durable and does not rust.
380. What is the use of metals in coins?
Metals like nickel are used in coins for their longevity and shine.
381. What is the use of non-metals in paints?
Non-metals like carbon are used in paints for their colour stability.
382. Why is aluminium used in foil?
Aluminium is used in foil because it is flexible and keeps food fresh.
383. What is the use of metals in bridges?
Metals like steel are used in bridges for their strength and load-bearing capacity.
384. What is the use of non-metals in glass?
385. Why is copper used in electrical circuits?
Copper is used in electrical circuits because it conducts electricity efficiently.
386. What is the use of metals in vehicles?
Metals like steel are used in vehicles for their durability and safety.
387. What is the use of non-metals in plastics?
388. Why is iron used in construction?
Iron is used in construction because it is strong and supports structures.
389. What is the use of metals in electronics?
Metals like copper are used in electronics for their conductivity and reliability.
390. What is the use of non-metals in tyres?
391. Why is stainless steel used in sinks?
392. What is the use of metals in coins?
Metals like copper are used in coins for their durability and aesthetic value.
393. What is the use of non-metals in fertilizers?
Non-metals like nitrogen are used in fertilizers to promote plant health.
394. Why is aluminium used in cans?
395. What is the use of metals in bridges?
396. What is the use of non-metals in paints?
397. Why is brass used in musical instruments?
398. What is the use of metals in tools?
399. What is the use of non-metals in rubber?
Non-metals like sulphur are used in rubber to enhance its elasticity.
400. Why is steel used in buildings?
Steel is used in buildings because it is strong and can support heavy structures.
401. What is the use of metals in wires?
402. What is the use of non-metals in glass?
403. Why is aluminium used in aircraft?
404. What is the use of metals in utensils?
405. What is the use of non-metals in plastics?
406. Why is iron used in railings?
407. What is the use of metals in machinery?
408. What is the use of non-metals in paints?
409. Why is copper used in electrical appliances?
410. What is the use of metals in vehicles?
411. What is the use of non-metals in tyres?
412. Why is stainless steel used in cutlery?
Stainless steel is used in cutlery because it is durable and rust-resistant.
413. What is the use of metals in coins?
414. What is the use of non-metals in fertilizers?
415. Why is aluminium used in foil?
Aluminium is used in foil because it is flexible and protects food.
416. What is the use of metals in bridges?
417. What is the use of non-metals in glass?
418. Why is copper used in electrical circuits?
419. What is the final goal of studying metals and non-metals?
The final goal of studying metals and non-metals is to understand their properties and applications.
420. How do metals and non-metals benefit daily life?
Metals and non-metals benefit daily life by providing materials for construction, electronics, and agriculture.
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