1. What is a metal?
A metal is shiny and conducts electricity.
2. Why are metals shiny?
Free electrons reflect light.
3. What is a non-metal?
A non-metal is dull and non-conductive.
4. Why are non-metals dull?
They lack free electrons.
5. What is malleability?
Malleability is forming thin sheets.
6. Why are metals malleable?
Layers of atoms slide.
7. What is ductility?
Ductility is drawing into wires.
8. Why are metals ductile?
Atoms bond strongly.
9. What is sonority?
Sonority is producing sound when struck.
10. Why are metals sonorous?
Their structure vibrates.
11. What conducts heat in metals?
Free electrons transfer heat.
12. Why don’t non-metals conduct heat?
13. What conducts electricity in metals?
Free electrons carry charge.
14. Why are non-metals insulators?
They have no free electrons.
15. What is the state of metals?
Most metals are solid.
16. Why is mercury liquid?
Weak metallic bonds.
17. What is the state of non-metals?
Non-metals are solid, liquid, or gas.
18. Why is bromine liquid?
Weak intermolecular forces.
19. What is density of metals?
Metals are generally dense.
20. Why is sodium less dense?
It has fewer atoms per volume.
21. What is density of non-metals?
Non-metals are less dense.
22. Why is carbon dense in diamond?
Strong covalent bonds.
23. What is melting point of metals?
Metals have high melting points.
24. Why is sodium’s melting point low?
Weaker metallic bonding.
25. What is melting point of non-metals?
Non-metals have low melting points.
26. Why is diamond’s melting point high?
Tight covalent structure.
27. What is tensile strength?
Ability to resist breaking.
28. Why do metals have high tensile strength?
Strong metallic bonds.
29. What is lustre?
Lustre is shininess.
30. Why do metals have lustre?
Electrons reflect light.
31. What is hardness of metals?
Metals are generally hard.
32. Why is sodium soft?
33. What is hardness of non-metals?
Non-metals are usually brittle.
34. Why is diamond hard?
Strong 3D covalent bonds.
35. What is a metalloid?
A metalloid has mixed properties.
36. Why is silicon a metalloid?
It conducts partially.
37. What is an example of a metalloid?
Silicon and germanium.
38. Why are metalloids used in electronics?
They control conductivity.
39. What is the reactivity series?
A list of metals by reactivity.
40. Why is potassium most reactive?
It loses electrons easily.
41. What is the least reactive metal?
Gold resists reactions.
42. Why is gold unreactive?
Stable electron configuration.
43. What reacts with water?
Potassium, sodium, calcium.
44. Why does sodium react with water?
It forms N a O H and H 2.
45. What is 2 N a + 2 H 2 O reaction?
2 N a + 2 H 2 O → 2 N a O H + H 2.
46. Why is H 2 gas produced?
Sodium displaces hydrogen.
47. What is K + H 2 O reaction?
2 K + 2 H 2 O → 2 K O H + H 2.
48. Why is K O H formed?
Potassium bonds with O H⁻.
49. What is C a + H 2 O reaction?
C a + 2 H 2 O → C a ( O H ) 2 + H 2.
50. Why is C a ( O H ) 2 formed?
Calcium bonds with O H⁻.
51. Why doesn’t copper react with water?
It’s below hydrogen in series.
52. What reacts with steam?
Magnesium, aluminium, zinc, iron.
53. What is M g + H 2 O (steam) reaction?
M g + H 2 O → M g O + H 2.
54. Why is M g O formed?
Magnesium bonds with oxygen.
55. What is Z n + H 2 O (steam) reaction?
Z n + H 2 O → Z n O + H 2.
56. Why is Z n O formed?
Zinc bonds with oxygen.
57. What is 3 F e + 4 H 2 O (steam) reaction?
3 F e + 4 H 2 O → F e 3 O 4 + 4 H 2.
58. Why is F e 3 O 4 formed?
Iron forms mixed oxide.
59. What reacts with dilute acids?
Metals above hydrogen in series.
60. What is Z n + H C l reaction?
Z n + 2 H C l → Z n C l 2 + H 2.
61. Why is Z n C l 2 formed?
Zinc bonds with chloride.
62. What is M g + H 2 S O 4 reaction?
M g + H 2 S O 4 → M g S O 4 + H 2.
63. Why is M g S O 4 formed?
Magnesium bonds with sulfate.
64. What is F e + H C l reaction?
F e + 2 H C l → F e C l 2 + H 2.
65. Why is F e C l 2 formed?
Iron bonds with chloride.
66. Why doesn’t copper react with H C l?
67. What is metal oxide nature?
Metal oxides are basic.
68. Why are metal oxides basic?
They form O H⁻ in water.
69. What is N a 2 O + H 2 O reaction?
N a 2 O + H 2 O → 2 N a O H.
70. Why is N a O H formed?
Sodium oxide reacts with water.
71. What is M g O + H 2 O reaction?
M g O + H 2 O → M g ( O H ) 2.
72. Why is M g ( O H ) 2 formed?
Magnesium oxide hydrates.
73. What is non-metal oxide nature?
Non-metal oxides are acidic.
74. Why are non-metal oxides acidic?
They form acids in water.
75. What is C O 2 + H 2 O reaction?
C O 2 + H 2 O → H 2 C O 3.
76. Why is H 2 C O 3 formed?
Carbon dioxide reacts with water.
77. What is S O 2 + H 2 O reaction?
S O 2 + H 2 O → H 2 S O 3.
78. Why is H 2 S O 3 formed?
Sulphur dioxide hydrates.
79. What is amphoteric oxide?
Reacts with acid and base.
80. Why is Z n O amphoteric?
It reacts with H C l and N a O H.
81. What is Z n O + H C l reaction?
Z n O + 2 H C l → Z n C l 2 + H 2 O.
82. Why is Z n C l 2 formed?
Zinc oxide neutralizes acid.
83. What is Z n O + N a O H reaction?
Z n O + 2 N a O H → N a 2 Z n O 2 + H 2 O.
84. Why is N a 2 Z n O 2 formed?
Zinc oxide forms zincate.
85. What is A l 2 O 3 + H C l reaction?
A l 2 O 3 + 6 H C l → 2 A l C l 3 + 3 H 2 O.
86. Why is A l C l 3 formed?
Aluminium oxide neutralizes acid.
87. What is A l 2 O 3 + N a O H reaction?
A l 2 O 3 + 2 N a O H → 2 N a A l O 2 + H 2 O.
88. Why is N a A l O 2 formed?
Aluminium oxide forms aluminate.
89. What is ionic bond?
Transfer of electrons forms ions.
90. Why do metals form ionic bonds?
They lose electrons easily.
91. What is N a C l structure?
N a C l has ionic lattice.
92. Why is N a C l solid?
Strong ionic bonds.
93. What is covalent bond?
Sharing of electrons.
94. Why do non-metals form covalent bonds?
They share electrons.
95. What is C O 2 bonding?
C O 2 has covalent bonds.
96. Why is C O 2 a gas?
97. What is metallic bond?
Electrons shared in metal lattice.
98. Why are metals conductive?
Free electrons move.
99. What is metal with oxygen reaction?
Metal + O 2 → metal oxide.
100. What is 4 N a + O 2 reaction?
4 N a + O 2 → 2 N a 2 O.
101. Why is N a 2 O formed?
Sodium bonds with oxygen.
102. What is 2 M g + O 2 reaction?
2 M g + O 2 → 2 M g O.
103. Why is M g O formed?
104. What is non-metal with oxygen reaction?
Non-metal + O 2 → non-metal oxide.
105. What is C + O 2 reaction?
C + O 2 → C O 2.
106. Why is C O 2 formed?
Carbon bonds with oxygen.
107. What is S + O 2 reaction?
S + O 2 → S O 2.
108. Why is S O 2 formed?
Sulphur bonds with oxygen.
109. What is displacement reaction?
More reactive metal displaces less.
110. What is F e + C u S O 4 reaction?
F e + C u S O 4 → F e S O 4 + C u.
111. Why is C u displaced?
Iron is more reactive.
112. What is Z n + C u S O 4 reaction?
Z n + C u S O 4 → Z n S O 4 + C u.
113. Why is Z n S O 4 formed?
Zinc displaces copper.
114. Why doesn’t C u displace Z n?
Copper is less reactive.
115. What is mineral?
Natural compound in earth’s crust.
116. What is ore?
Mineral from which metal is extracted.
117. Why is bauxite an ore?
It yields aluminium.
118. What is gangue?
Impurity in ore.
119. Why remove gangue?
To purify metal.
120. What is concentration of ore?
Removing impurities from ore.
121. What is froth flotation?
Separates sulphide ores using foam.
122. Why use froth flotation?
To concentrate sulphide ores.
123. What is roasting?
Heating sulphide ore in air.
124. What is 2 Z n S + 3 O 2 reaction?
2 Z n S + 3 O 2 → 2 Z n O + 2 S O 2.
125. Why is Z n O formed?
Sulphide converts to oxide.
126. What is calcination?
Heating carbonate ore in no air.
127. What is Z n C O 3 reaction?
Z n C O 3 → Z n O + C O 2.
128. Why is C O 2 released?
Carbonate decomposes.
129. What is reduction?
Removing oxygen from oxide.
130. What is Z n O + C reaction?
Z n O + C → Z n + C O.
131. Why is Z n formed?
Carbon reduces zinc oxide.
132. What is electrolysis?
Using electricity to extract metal.
133. Why is aluminium extracted by electrolysis?
It’s highly reactive.
134. What is electrolyte in aluminium extraction?
Molten A l 2 O 3 with cryolite.
135. Why use cryolite?
Lowers melting point.
136. What is anode in electrolysis?
Carbon rods release oxygen.
137. What is cathode in electrolysis?
Aluminium collects at cathode.
138. What is refining?
Purifying extracted metal.
139. What is electrolytic refining?
Using electrolysis to purify metals.
140. What is anode in copper refining?
Impure copper slab.
141. What is cathode in copper refining?
Pure copper strip.
142. What is electrolyte in copper refining?
C u S O 4 solution.
143. Why is copper purified?
To improve conductivity.
144. What is corrosion?
Metal reacts with environment.
145. Why does iron corrode?
It forms F e 2 O 3 with O 2 and H 2 O.
146. What is rust?
F e 2 O 3 · x H 2 O is rust.
147. Why is rust flaky?
It’s loosely bound.
148. Why doesn’t aluminium corrode?
A l 2 O 3 layer protects it.
149. What prevents corrosion?
Painting, galvanizing, alloying.
150. What is galvanizing?
Coating iron with zinc.
151. Why use zinc for galvanizing?
Zinc is more reactive.
152. What is sacrificial protection?
Using more reactive metal.
153. Why use magnesium for protection?
It corrodes instead of iron.
154. What is alloy?
Mixture of metals or metal with non-metal.
155. Why make alloys?
To enhance properties.
156. What is brass?
Copper and zinc alloy.
157. Why is brass stronger?
Zinc disrupts copper lattice.
158. What is bronze?
Copper and tin alloy.
159. Why is bronze corrosion-resistant?
Tin forms protective layer.
160. What is stainless steel?
Iron, chromium, nickel alloy.
161. Why is stainless steel rust-proof?
Chromium forms oxide layer.
162. What is amalgam?
Mercury with metal alloy.
163. Why is amalgam used?
In dental fillings.
164. What is solder?
Lead and tin alloy.
165. Why is solder used?
For joining metals.
166. What is steel?
Iron and carbon alloy.
167. Why is steel strong?
Carbon strengthens lattice.
168. What is duralumin?
Aluminium, copper, magnesium alloy.
169. Why is duralumin lightweight?
Aluminium base metal.
170. What is magnalium?
Aluminium and magnesium alloy.
171. Why is magnalium used?
For aircraft parts.
172. What is nichrome?
Nickel and chromium alloy.
173. Why is nichrome used?
In heating elements.
174. What is metal chloride nature?
Metal chlorides are ionic.
175. Why is N a C l soluble?
It dissociates in water.
176. What is C u C l 2 colour?
C u C l 2 is blue-green.
177. Why is C u C l 2 coloured?
Copper ions absorb light.
178. What is non-metal chloride nature?
Non-metal chlorides are covalent.
179. Why is C C l 4 liquid?
Weak covalent bonds.
180. What is metal sulphate nature?
Metal sulphates are ionic.
181. What is C u S O 4 colour?
C u S O 4 is blue.
182. Why is C u S O 4 blue?
Hydrated copper ions.
183. What is F e S O 4 colour?
F e S O 4 is green.
184. Why is F e S O 4 green?
Iron(II) ions absorb light.
185. What is Z n S O 4 use?
Z n S O 4 in fertilizers.
186. Why is Z n S O 4 soluble?
It forms ions in water.
187. What is haematite?
F e 2 O 3 is iron ore.
188. Why is haematite used?
To extract iron.
189. What is bauxite?
A l 2 O 3 is aluminium ore.
190. Why is bauxite purified?
To remove impurities.
191. What is cinnabar?
H g S is mercury ore.
192. Why is cinnabar roasted?
To extract mercury.
193. What is zinc blende?
Z n S is zinc ore.
194. Why is zinc blende concentrated?
To enrich zinc content.
195. What is copper pyrites?
C u F e S 2 is copper ore.
196. Why is copper pyrites roasted?
To remove sulphur.
197. What is smelting?
Reducing oxide to metal.
198. Why use coke in smelting?
Coke acts as reducing agent.
199. What is flux?
Removes impurities as slag.
200. What is slag?
Impurity fused with flux.
201. Why is limestone used?
It forms slag with silica.
202. What is iron extraction furnace?
Blast furnace extracts iron.
203. What is charge in blast furnace?
Iron ore, coke, limestone.
204. What is F e 2 O 3 + 3 C O reaction?
F e 2 O 3 + 3 C O → 2 F e + 3 C O 2.
205. Why is F e formed?
Carbon monoxide reduces oxide.
206. What is pig iron?
Impure iron from furnace.
207. Why is pig iron brittle?
High carbon content.
208. What is cast iron?
2-4% carbon iron.
209. Why is cast iron hard?
Carbon strengthens it.
210. What is wrought iron?
Purest form of iron.
211. Why is wrought iron soft?
Low carbon content.
212. What is thermite reaction?
A l + F e 2 O 3 → A l 2 O 3 + F e.
213. Why is thermite exothermic?
It releases heat.
214. What is anodizing?
Coating aluminium with oxide.
215. Why anodize aluminium?
To prevent corrosion.
216. What is tinning?
Coating iron with tin.
217. Why tin food cans?
Tin resists corrosion.
218. What is electroplating?
Coating metal using electricity.
219. Why electroplate chromium?
For shine and protection.
220. What is cathode in electroplating?
Object to be plated.
221. What is anode in electroplating?
Metal to deposit.
222. What is electrolyte in electroplating?
Metal salt solution.
223. What is N a use?
Sodium in coolants.
224. Why use sodium in reactors?
High heat conductivity.
225. What is M g use?
Magnesium in flares.
226. Why use magnesium in flares?
It burns brightly.
227. What is A l use?
Aluminium in aircraft.
228. Why use aluminium in planes?
It’s lightweight and strong.
229. What is F e use?
Iron in construction.
230. Why use iron in buildings?
It’s strong and cheap.
231. What is C u use?
Copper in wires.
232. Why use copper in wires?
High electrical conductivity.
233. What is Z n use?
Zinc in galvanizing.
234. Why use zinc in coating?
It prevents rust.
235. What is A g use?
Silver in jewellery.
236. Why use silver in jewellery?
It’s shiny and unreactive.
237. What is A u use?
Gold in electronics.
238. Why use gold in circuits?
It resists corrosion.
239. What is C use?
Carbon in fuels.
240. Why use carbon in fuels?
It releases energy.
241. What is S use?
Sulphur in acids.
242. Why use sulphur in H 2 S O 4?
It forms acidic oxides.
243. What is P use?
Phosphorus in fertilizers.
244. Why use phosphorus in fertilizers?
It aids plant growth.
245. What is C l use?
Chlorine in disinfectants.
246. Why use chlorine in water?
It kills bacteria.
247. What is I use?
Iodine in antiseptics.
248. Why use iodine in medicine?
It prevents infections.
249. What is Si use?
Silicon in chips.
250. Why use silicon in electronics?
It’s a semiconductor.
251. What is metal carbonate nature?
Metal carbonates are basic.
252. What is C a C O 3 use?
C a C O 3 in cement.
253. Why use C a C O 3 in cement?
It forms strong bonds.
254. What is Z n C O 3 reaction?
255. Why is Z n O formed?
Carbonate decomposes on heating.
256. What is metal sulphide nature?
Metal sulphides are ionic.
257. What is Z n S roasting reaction?
258. Why is S O 2 produced?
Sulphur oxidizes.
259. What is C u 2 S roasting reaction?
2 C u 2 S + 3 O 2 → 2 C u 2 O + 2 S O 2.
260. Why is C u 2 O formed?
Copper sulphide oxidizes.
261. What is non-metal hydride?
Covalent compounds like N H 3.
262. Why is N H 3 covalent?
Nitrogen shares electrons.
263. What is metal hydride?
Ionic like N a H.
264. Why is N a H ionic?
Sodium transfers electron.
265. What is aqua regia?
3 H C l + H N O 3 mixture.
266. Why use aqua regia?
It dissolves gold.
267. What is gold’s reactivity?
Gold is least reactive.
268. Why is gold in native state?
It resists oxidation.
269. What is silver’s reactivity?
Silver is less reactive.
270. Why does silver tarnish?
It forms A g 2 S with H 2 S.
271. What is A g 2 S colour?
A g 2 S is black.
272. Why is A g 2 S formed?
Silver reacts with sulphur.
273. What is copper’s reactivity?
Copper is moderately reactive.
274. Why does copper turn green?
Forms C u C O 3 · C u ( O H ) 2.
275. What is C u C O 3 · C u ( O H ) 2?
Green patina on copper.
276. Why is patina protective?
It prevents further corrosion.
277. What is iron’s reactivity?
Iron is moderately reactive.
278. Why does iron rust?
It reacts with O 2 and H 2 O.
279. What is zinc’s reactivity?
Zinc is more reactive than iron.
280. Why is zinc used in batteries?
281. What is aluminium’s reactivity?
Aluminium is highly reactive.
282. Why doesn’t aluminium corrode?
A l 2 O 3 layer forms.
283. What is magnesium’s reactivity?
Magnesium is very reactive.
284. Why does magnesium burn?
It forms M g O with O 2.
285. What is sodium’s reactivity?
Sodium is highly reactive.
286. Why is sodium stored in kerosene?
It reacts with air and water.
287. What is potassium’s reactivity?
Potassium is most reactive.
288. Why does potassium ignite?
It reacts violently with water.
289. What is carbon’s bonding?
Carbon forms covalent bonds.
290. Why is diamond covalent?
Carbon atoms share electrons.
291. What is sulphur’s state?
Sulphur is solid non-metal.
292. Why is sulphur brittle?
Weak molecular bonds.
293. What is phosphorus’s reactivity?
Phosphorus is very reactive.
294. Why is phosphorus stored in water?
It ignites in air.
295. What is chlorine’s state?
Chlorine is a gas.
296. Why is chlorine reactive?
It gains electrons easily.
297. What is iodine’s state?
Iodine is a solid.
298. Why is iodine shiny?
Weak metallic character.
299. What is silicon’s structure?
Silicon has covalent lattice.
300. Why is silicon hard?
301. What is hydrogen’s bonding?
Hydrogen forms covalent bonds.
302. Why is H 2 a gas?
303. What is nitrogen’s bonding?
Nitrogen forms triple bonds.
304. Why is N 2 unreactive?
Strong triple bond.
305. What is oxygen’s role?
Oxygen supports combustion.
306. Why is O 2 reactive?
It accepts electrons.
307. What is metal nitrate nature?
Metal nitrates are ionic.
308. What is C u ( N O 3 ) 2 colour?
C u ( N O 3 ) 2 is blue.
309. Why is C u ( N O 3 ) 2 soluble?
Nitrates dissolve in water.
310. What is F e ( N O 3 ) 3 colour?
F e ( N O 3 ) 3 is violet.
311. Why is F e ( N O 3 ) 3 coloured?
Iron(III) ions absorb light.
312. What is metal hydroxide nature?
Metal hydroxides are basic.
313. What is N a O H use?
N a O H in soap making.
314. Why is N a O H soluble?
315. What is C a ( O H ) 2 use?
C a ( O H ) 2 in limewater.
316. Why is C a ( O H ) 2 insoluble?
Low solubility product.
317. What is metal oxide reduction?
Metal oxide to metal.
318. What is C u O + H 2 reaction?
C u O + H 2 → C u + H 2 O.
319. Why is C u formed?
Hydrogen reduces copper oxide.
320. What is F e 2 O 3 + A l reaction?
F e 2 O 3 + 2 A l → 2 F e + A l 2 O 3.
321. Why is F e formed?
Aluminium reduces iron oxide.
322. What is ionic compound property?
High melting point, soluble.
323. Why is M g C l 2 solid?
324. What is covalent compound property?
Low melting point, insoluble.
325. Why is S i O 2 solid?
3D covalent network.
326. What is metal use in cables?
Copper for conductivity.
327. Why is copper in cables?
Low resistance to current.
328. What is metal in utensils?
Stainless steel for durability.
329. Why use stainless steel?
It resists rust.
330. What is non-metal in tyres?
Carbon black for strength.
331. Why use carbon in tyres?
It improves wear resistance.
332. What is metal in bridges?
Iron for strength.
333. Why use iron in bridges?
High tensile strength.
334. What is non-metal in fertilizers?
Nitrogen for growth.
335. Why use nitrogen in fertilizers?
It forms proteins.
336. What is metal in coins?
Copper or nickel alloys.
337. Why use alloys in coins?
They resist wear.
338. What is non-metal in glass?
Silicon in silica.
339. Why use silicon in glass?
It forms strong network.
340. What is metal in batteries?
Zinc or lithium.
341. Why use zinc in batteries?
It provides electrons.
342. What is non-metal in matches?
Phosphorus for ignition.
343. Why use phosphorus in matches?
It catches fire easily.
344. What is metal in tools?
Steel for hardness.
345. Why use steel in tools?
It retains edge.
346. What is non-metal in plastics?
Carbon in polymers.
347. Why use carbon in plastics?
It forms chains.
348. What is metal in ships?
Steel for strength.
349. Why use steel in ships?
It withstands pressure.
350. What is non-metal in insulation?
Sulphur in rubber.
351. Why use sulphur in rubber?
It improves elasticity.
352. What is metal in jewellery?
Gold for shine.
353. Why use gold in jewellery?
It doesn’t tarnish.
354. What is non-metal in pencils?
Carbon as graphite.
355. Why use graphite in pencils?
It leaves marks.
356. What is metal in pipes?
Copper for plumbing.
357. Why use copper in pipes?
358. What is non-metal in disinfectants?
Chlorine for sterilization.
359. Why use chlorine in disinfectants?
It kills germs.
360. What is metal in cars?
Aluminium for lightness.
361. Why use aluminium in cars?
It reduces weight.
362. What is non-metal in air?
Nitrogen for stability.
363. Why is nitrogen in air?
It dilutes oxygen.
364. What is metal in magnets?
Iron for magnetism.
365. Why use iron in magnets?
It aligns domains.
366. What is non-metal in explosives?
Nitrogen in nitrates.
367. Why use nitrogen in explosives?
368. What is metal in foil?
Aluminium for packaging.
369. Why use aluminium in foil?
It’s flexible and light.
370. What is non-metal in lamps?
Argon for glow.
371. Why use argon in lamps?
It prevents filament burn.
372. What is metal in bells?
Bronze for sound.
373. Why use bronze in bells?
It resonates well.
374. What is non-metal in medicines?
Iodine for healing.
375. Why use iodine in medicines?
It’s antiseptic.
376. What is metal in roofs?
Zinc for coating.
377. Why use zinc in roofs?
378. What is non-metal in fuels?
Carbon in coal.
379. Why use carbon in fuels?
It burns efficiently.
380. What is metal in screws?
381. Why use steel in screws?
It holds tightly.
382. What is non-metal in dyes?
Carbon in pigments.
383. Why use carbon in dyes?
It forms colours.
384. What is metal in cans?
Tin-coated steel.
385. Why use tin in cans?
386. What is non-metal in ceramics?
Silicon in clay.
387. Why use silicon in ceramics?
It forms structure.
388. What is metal in rails?
Steel for durability.
389. Why use steel in rails?
It withstands weight.
390. What is non-metal in batteries?
Carbon as electrode.
391. Why use carbon in batteries?
It conducts current.
392. What is metal in mirrors?
Silver for reflection.
393. Why use silver in mirrors?
It reflects light well.
394. What is non-metal in airbags?
Nitrogen for inflation.
395. Why use nitrogen in airbags?
It’s inert and fast.
396. What is metal in springs?
Steel for elasticity.
397. Why use steel in springs?
It regains shape.
398. What is non-metal in paints?
399. Why use carbon in paints?
It provides colour.
400. What is metal in frames?
Aluminium for strength.
401. Why use aluminium in frames?
It’s light and strong.
402. What is non-metal in insulation?
Oxygen in foam.
403. Why use oxygen in foam?
It traps air.
404. What is metal in turbines?
Nickel for heat resistance.
405. Why use nickel in turbines?
It withstands high temperatures.
406. What is non-metal in lubricants?
Graphite for slipperiness.
407. Why use graphite in lubricants?
Layers slide easily.
408. What is metal in coins?
Nickel for durability.
409. Why use nickel in coins?
It resists wear.
410. What is non-metal in fireworks?
Sulphur for explosion.
411. Why use sulphur in fireworks?
It burns quickly.
412. What is metal in engines?
413. Why use iron in engines?
It handles stress.
414. What is non-metal in tyres?
415. Why use sulphur in tyres?
It adds strength.
416. What is metal in wires?
Aluminium for conductivity.
417. Why use aluminium in wires?
It’s cost-effective.
418. What is non-metal in electronics?
Silicon in circuits.
419. Why use silicon in circuits?
It controls electrons.
420. What is metal in cutlery?
Stainless steel for shine.
421. Why use stainless steel in cutlery?
It doesn’t rust.
422. What is non-metal in adhesives?
Carbon in glue.
423. Why use carbon in adhesives?
It forms bonds.
424. What is metal in bolts?
Steel for toughness.
425. Why use steel in bolts?
It resists shear.
426. What is non-metal in antiseptics?
427. Why use iodine in antiseptics?
428. What is metal in armour?
Steel for protection.
429. Why use steel in armour?
It absorbs impact.
430. What is non-metal in detergents?
Phosphorus in phosphates.
431. Why use phosphorus in detergents?
It softens water.
432. What is metal in rods?
433. Why use copper in rods?
It grounds electricity.
434. What is non-metal in cosmetics?
435. Why use carbon in cosmetics?
It adds colour.
436. What is metal in bearings?
Steel for smoothness.
437. Why use steel in bearings?
It reduces friction.
438. What is non-metal in filters?
Carbon for absorption.
439. Why use carbon in filters?
It traps impurities.
440. What is metal in locks?
Brass for durability.
441. Why use brass in locks?
442. What is non-metal in inks?
Carbon in dyes.
443. Why use carbon in inks?
It provides pigment.
444. What is metal in statues?
Bronze for longevity.
445. Why use bronze in statues?
It weathers well.
446. What is non-metal in textiles?
Carbon in fibres.
447. Why use carbon in textiles?
It forms polymers.
448. What is metal in chains?
449. Why use iron in chains?
It holds weight.
450. What is non-metal in pesticides?
Chlorine in compounds.
451. Why use chlorine in pesticides?
It kills pests.
452. What is metal in hinges?
453. Why use steel in hinges?
It withstands stress.
454. What is non-metal in coatings?
Carbon in paints.
455. Why use carbon in coatings?
It adds durability.
456. What is metal in gears?
457. Why use steel in gears?
458. What is non-metal in soaps?
Carbon in fats.
459. Why use carbon in soaps?
460. What is metal in nails?
461. Why use iron in nails?
It holds firmly.
462. What is non-metal in explosives?
Carbon in TNT.
463. Why use carbon in TNT?
464. What is metal in pipes?
465. Why use steel in pipes?
It handles pressure.
466. What is non-metal in drugs?
Carbon in molecules.
467. Why use carbon in drugs?
It forms structures.
468. What is metal in wheels?
469. Why use aluminium in wheels?
470. What is non-metal in cement?
471. Why use silicon in cement?
It strengthens bonds.
472. What is metal in tools?
Iron for toughness.
473. Why use iron in tools?
It retains strength.
474. What is non-metal in perfumes?
Carbon in scents.
475. Why use carbon in perfumes?
It forms aromas.
476. What is metal in clocks?
Brass for gears.
477. Why use brass in clocks?
It’s durable.
478. What is non-metal in paper?
Carbon in cellulose.
479. Why use carbon in paper?
It forms fibres.
480. What is metal in lamps?
Tungsten for filament.
481. Why use tungsten in lamps?
High melting point.
482. What is non-metal in food?
Carbon in sugars.
483. Why use carbon in food?
It provides energy.
484. What is metal in cables?
485. Why use steel in cables?
It supports weight.
486. What is non-metal in tyres?
Carbon in rubber.
487. Why use carbon in rubber?
It adds toughness.
488. What is metal in containers?
489. Why use steel in containers?
It protects contents.
490. What is non-metal in glass?
Oxygen in silica.
491. Why use oxygen in glass?
It forms network.
492. What is metal in frames?
Iron for rigidity.
493. Why use iron in frames?
It holds structure.
494. What is non-metal in fuels?
Hydrogen in gas.
495. Why use hydrogen in fuels?
It burns cleanly.
496. What is metal in coins?
Copper for value.
497. Why use copper in coins?
498. What is non-metal in insulation?
Nitrogen in foam.
499. Why use nitrogen in insulation?
It traps heat.
500. What is metal in roofs?
Copper for longevity.
501. Why use copper in roofs?
It forms patina.
502. What is non-metal in plastics?
Oxygen in polymers.
503. Why use oxygen in plastics?
504. What is metal in wires?
Silver for conductivity.
505. Why use silver in wires?
Best conductor.
506. What is non-metal in fibres?
Carbon in nylon.
507. Why use carbon in nylon?
508. What is metal in engines?
509. Why use steel in engines?
It withstands heat.
510. What is non-metal in batteries?
Sulphur in acid.
511. Why use sulphur in batteries?
It conducts ions.
512. What is metal in utensils?
513. Why use aluminium in utensils?
It conducts heat.
514. What is non-metal in explosives?
Oxygen in nitrates.
515. Why use oxygen in explosives?
It fuels reaction.
516. What is metal in jewellery?
Silver for shine.
517. Why use silver in jewellery?
It’s affordable.
518. What is non-metal in cement?
Carbon in additives.
519. Why use carbon in cement?
It enhances strength.
520. What is metal in pipes?
521. Why use iron in pipes?
522. What is non-metal in paints?
Oxygen in binders.
523. Why use oxygen in paints?
It forms films.
524. What is metal in screws?
Iron for grip.
525. Why use iron in screws?
526. What is non-metal in drugs?
Nitrogen in compounds.
527. Why use nitrogen in drugs?
It forms molecules.
528. What is metal in bells?
Copper for tone.
529. Why use copper in bells?
It vibrates well.
530. What is non-metal in inks?
Oxygen in dyes.
531. Why use oxygen in inks?
It stabilizes colour.
532. What is metal in cars?
Steel for frame.
533. Why use steel in cars?
It ensures safety.
534. What is non-metal in tyres?
Nitrogen in rubber.
535. Why use nitrogen in rubber?
It adds elasticity.
536. What is metal in bridges?
Steel for span.
537. Why use steel in bridges?
It supports load.
538. What is non-metal in glass?
539. Why use carbon in glass?
It adjusts properties.
540. What is metal in cables?
Aluminium for cost.
541. Why use aluminium in cables?
It’s lightweight.
542. What is non-metal in fuels?
Oxygen in ethanol.
543. Why use oxygen in ethanol?
It aids combustion.
544. What is metal in tools?
Steel for edge.
545. Why use steel in tools?
It stays sharp.
546. What is non-metal in plastics?
Nitrogen in polymers.
547. Why use nitrogen in polymers?
548. What is metal in ships?
Iron for hull.
549. Why use iron in ships?
It’s strong.
550. What is non-metal in batteries?
Oxygen in electrolytes.
551. Why use oxygen in electrolytes?
It aids reactions.
552. What is metal in coins?
Silver for value.
553. Why use silver in coins?
554. What is non-metal in paints?
Nitrogen in pigments.
555. Why use nitrogen in pigments?
556. What is metal in wires?
Copper for efficiency.
557. Why use copper in wires?
It conducts well.
558. What is non-metal in ceramics?
Oxygen in clay.
559. Why use oxygen in clay?
560. What is metal in frames?
Steel for support.
561. Why use steel in frames?
It’s rigid.
562. What is non-metal in adhesives?
Oxygen in glue.
563. Why use oxygen in glue?
It binds surfaces.
564. What is metal in springs?
Iron for elasticity.
565. Why use iron in springs?
It rebounds well.
566. What is non-metal in inks?
Nitrogen in dyes.
567. Why use nitrogen in dyes?
568. What is metal in locks?
Steel for security.
569. Why use steel in locks?
It’s tough.
570. What is non-metal in textiles?
Oxygen in fibres.
571. Why use oxygen in fibres?
572. What is metal in hinges?
573. Why use iron in hinges?
574. What is non-metal in soaps?
Oxygen in fats.
575. Why use oxygen in fats?
576. What is metal in gears?
Iron for durability.
577. Why use iron in gears?
578. What is non-metal in perfumes?
Oxygen in scents.
579. Why use oxygen in scents?
580. What is metal in nails?
Steel for grip.
581. Why use steel in nails?
582. What is non-metal in drugs?
Oxygen in compounds.
583. Why use oxygen in compounds?
584. What is metal in bells?
Brass for sound.
585. Why use brass in bells?
It resonates clearly.
586. What is non-metal in paints?
Carbon in binders.
587. Why use carbon in binders?
588. What is metal in cars?
Iron for chassis.
589. Why use iron in chassis?
It provides strength.
590. What is non-metal in glass?
Nitrogen in additives.
591. Why use nitrogen in additives?
592. What is metal in bridges?
Iron for stability.
593. Why use iron in bridges?
594. What is non-metal in fuels?
Nitrogen in gas.
595. Why use nitrogen in gas?
It stabilizes combustion.
596. What is metal in cables?
Copper for strength.
597. Why use copper in cables?
It conducts electricity.
598. What is non-metal in plastics?
Carbon in chains.
599. Why use carbon in chains?
600. What is metal in tools?
Iron for hardness.
601. Why use iron in tools?
It stays durable.
602. What is non-metal in batteries?
Nitrogen in electrolytes.
603. Why use nitrogen in electrolytes?
604. What is metal in coins?
Nickel for shine.
605. Why use nickel in coins?
606. What is non-metal in inks?
607. Why use carbon in pigments?
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