1. What is a pure substance?
A pure substance has a fixed composition and definite properties.
2. Why is air considered a mixture?
Air contains different gases in varying proportions.
3. What is a mixture?
A mixture contains two or more substances mixed physically.
4. Why is gold a pure substance?
Gold consists of only one type of atom.
5. What is a homogeneous mixture?
A homogeneous mixture has a uniform composition throughout.
6. Why is saltwater a homogeneous mixture?
Salt dissolves completely, giving a uniform solution.
7. What is a heterogeneous mixture?
A heterogeneous mixture has non-uniform composition.
8. Why is sand and water a heterogeneous mixture?
Sand settles, creating distinct layers with water.
9. What is a solution?
A solution is a homogeneous mixture of two or more substances.
10. Why does sugar dissolve in water?
Sugar molecules interact with water molecules and spread evenly.
11. What is a solute?
A solute is the substance that dissolves in a solvent.
12. Why is water called a solvent?
Water dissolves many substances to form solutions.
13. What is a suspension?
A suspension is a heterogeneous mixture with visible particles that settle.
14. Why does muddy water form a suspension?
Mud particles are large and settle over time.
15. What is a colloid?
A colloid is a mixture with particles dispersed but not settled.
16. Why is milk a colloid?
Milk has fat globules dispersed in water.
17. What is the Tyndall effect?
The Tyndall effect is the scattering of light by colloidal particles.
18. Why does a true solution not show the Tyndall effect?
True solution particles are too small to scatter light.
19. What is an alloy?
An alloy is a homogeneous mixture of two or more metals.
20. Why is brass an alloy?
Brass is a mixture of copper and zinc.
21. What is a physical change?
A physical change alters form without changing composition.
22. Why is melting ice a physical change?
Melting ice changes state but remains water.
23. What is a chemical change?
A chemical change forms new substances with different properties.
24. Why is burning wood a chemical change?
Burning wood produces ash and gases, new substances.
25. What is filtration used for?
Filtration separates insoluble solids from liquids.
26. Why is sand separated from water by filtration?
Sand particles are too large to pass through filter paper.
27. What is evaporation?
Evaporation is the process of turning liquid into vapor.
28. Why is evaporation used to obtain salt?
Evaporation removes water, leaving salt behind.
29. What is centrifugation?
Centrifugation separates particles based on density using spinning.
30. Why is centrifugation used in blood analysis?
It separates denser blood cells from plasma.
31. What is distillation?
Distillation separates liquids based on different boiling points.
32. Why is distillation used to purify water?
Water boils and condenses, leaving impurities behind.
33. What is fractional distillation?
Fractional distillation separates liquids with close boiling points.
34. Why is fractional distillation used in petroleum refining?
Petroleum has components with similar boiling points.
35. What is chromatography?
Chromatography separates components based on their solubility.
36. Why is paper chromatography used for dyes?
Dyes move at different rates on paper with a solvent.
37. What is sublimation used for?
Sublimation separates substances that turn directly into gas.
38. Why is sublimation used to purify naphthalene?
Naphthalene sublimes, leaving impurities behind.
39. What is a saturated solution?
A saturated solution cannot dissolve more solute at a given temperature.
40. Why does sugar stop dissolving in a saturated solution?
The solution has reached its maximum solute capacity.
41. What is an unsaturated solution?
An unsaturated solution can dissolve more solute.
42. Why can more salt dissolve in an unsaturated solution?
The solution has not reached its solute limit.
43. What is a supersaturated solution?
A supersaturated solution holds more solute than it normally can.
44. Why does a supersaturated solution crystallize easily?
Excess solute precipitates with slight disturbance.
45. What is concentration?
Concentration is the amount of solute in a given solvent.
46. Why is a concentrated solution darker?
More solute particles absorb or scatter light.
47. What is a dilute solution?
A dilute solution has a small amount of solute.
48. Why is a dilute solution lighter in color?
Fewer solute particles cause less light absorption.
49. What is an element?
An element is a pure substance with one type of atom.
50. Why is oxygen an element?
Oxygen consists of only oxygen atoms.
51. What is a compound?
A compound is a pure substance with two or more elements chemically combined.
52. Why is water a compound?
Water has hydrogen and oxygen in a fixed ratio.
53. What is a mixture’s composition like?
A mixture’s composition can vary.
54. Why can a mixture’s properties differ?
Mixtures depend on the proportion of components.
55. What is a true solution?
A true solution is a homogeneous mixture with tiny particles.
56. Why is sugar syrup a true solution?
Sugar dissolves completely, forming a uniform mixture.
57. What is the solvent in a sugar solution?
Water is the solvent in a sugar solution.
58. Why is alcohol a solvent?
Alcohol dissolves substances like tincture of iodine.
59. What is the solute in brine?
Salt is the solute in brine.
60. Why is a colloid stable?
Colloid particles are small enough to remain dispersed.
61. What is an emulsion?
An emulsion is a colloid of two liquids.
62. Why is mayonnaise an emulsion?
Mayonnaise has oil dispersed in water.
63. What is a foam?
A foam is a colloid with gas dispersed in a liquid.
64. Why is whipped cream a foam?
Whipped cream has gas bubbles in a liquid.
65. What is a gel?
A gel is a colloid with a liquid trapped in a solid.
66. Why is jelly a gel?
Jelly has liquid trapped in a solid structure.
67. What is the dispersing medium in a colloid?
The dispersing medium is the substance particles are spread in.
68. Why is water the dispersing medium in milk?
Water holds the fat globules in milk.
69. What is the dispersed phase in a colloid?
The dispersed phase is the substance spread in the medium.
70. Why are fat globules the dispersed phase in milk?
Fat globules are spread throughout the water in milk.
71. What is a sol?
A sol is a colloid with a solid dispersed in a liquid.
72. Why is paint a sol?
Paint has solid pigment particles in a liquid.
73. What is the Tyndall effect in fog?
Fog scatters light due to water droplets.
74. Why does a suspension settle?
Suspension particles are large and heavy.
75. What is the solvent in a tincture of iodine?
Alcohol is the solvent in a tincture of iodine.
76. Why is a solution transparent?
Solution particles are too small to scatter light.
77. What is a physical property?
A physical property can be observed without changing composition.
78. Why is color a physical property?
Color can be seen without altering the substance.
79. What is a chemical property?
A chemical property describes how a substance reacts.
80. Why is flammability a chemical property?
Flammability involves a reaction with oxygen.
81. What is crystallization?
Crystallization forms pure solid crystals from a solution.
82. Why is crystallization used to purify sugar?
Sugar forms pure crystals, leaving impurities behind.
83. What is a separating funnel used for?
A separating funnel separates immiscible liquids.
84. Why is a separating funnel used for oil and water?
Oil and water have different densities and do not mix.
85. What is magnetic separation?
Magnetic separation removes magnetic substances from a mixture.
86. Why is magnetic separation used for iron filings?
Iron filings are attracted to a magnet.
87. What is handpicking?
Handpicking separates large, visible impurities.
88. Why is handpicking used for stones in rice?
Stones are easily visible and can be removed manually.
89. What is sieving?
Sieving separates particles based on size.
90. Why is sieving used for flour?
Flour passes through, leaving larger impurities behind.
91. What is winnowing?
Winnowing separates lighter particles using wind.
92. Why is winnowing used for husk and grain?
Husk is lighter and blows away, leaving grain.
93. What is sedimentation?
Sedimentation allows heavy particles to settle in a liquid.
94. Why is sedimentation used for muddy water?
Mud particles settle at the bottom over time.
95. What is decantation?
Decantation pours off liquid, leaving settled solids.
96. Why is decantation used after sedimentation?
It separates clear liquid from settled particles.
97. What is the boiling point of ethanol?
The boiling point of ethanol is 78°C.
98. Why is ethanol separated by distillation?
Ethanol has a lower boiling point than water.
99. What is a pure substance’s composition like?
A pure substance has a fixed composition.
100. Why is a compound different from a mixture?
A compound has a fixed ratio, mixtures do not.
101. What is the solute in a soda?
Carbon dioxide and sugar are solutes in soda.
102. Why is soda a solution?
Soda is a homogeneous mixture of gases and liquids.
103. What is the solvent in a brass alloy?
Copper is the solvent in a brass alloy.
104. Why is steel an alloy?
Steel is a mixture of iron and carbon.
105. What is a concentrated solution?
A concentrated solution has a high amount of solute.
106. Why is a concentrated solution stronger?
More solute increases the solution’s intensity.
107. What is a dilute solution used for?
A dilute solution is used when less solute is needed.
108. Why is a dilute solution weaker?
Less solute reduces the solution’s effect.
109. What is a mixture’s separation based on?
A mixture’s separation is based on physical properties.
110. Why can mixtures be separated easily?
Mixtures are not chemically bonded.
111. What is a compound’s separation like?
A compound requires chemical methods to separate.
112. Why is water not a mixture?
Water is a compound with a fixed ratio of elements.
113. What is the dispersed phase in fog?
Water droplets are the dispersed phase in fog.
114. Why is fog a colloid?
Fog has water droplets dispersed in air.
115. What is the dispersing medium in smoke?
Air is the dispersing medium in smoke.
116. Why is smoke a colloid?
Smoke has solid particles dispersed in air.
117. What is a suspension’s particle size?
A suspension has particles larger than 1000 nm.
118. Why do suspensions appear cloudy?
Large particles scatter light in suspensions.
119. What is a colloid’s particle size?
A colloid has particles between 1 and 1000 nm.
120. Why do colloids appear homogeneous?
Colloid particles are small and evenly dispersed.
121. What is a true solution’s particle size?
A true solution has particles smaller than 1 nm.
122. Why are true solutions clear?
Tiny particles do not scatter light in true solutions.
123. What is the solvent in a lemonade solution?
Water is the solvent in a lemonade solution.
124. Why is lemonade a solution?
Lemonade is a homogeneous mixture of sugar and lemon juice.
125. What is the solute in a copper sulfate solution?
Copper sulfate is the solute in the solution.
126. Why is copper sulfate solution blue?
Copper ions absorb specific light wavelengths.
127. What is a physical change in water?
Boiling water is a physical change.
128. Why is boiling a physical change?
Boiling changes water’s state, not its composition.
129. What is a chemical change in iron?
Rusting of iron is a chemical change.
130. Why is rusting a chemical change?
Rusting forms iron oxide, a new substance.
131. What is the Tyndall effect in a colloid?
Colloid particles scatter light, making a beam visible.
132. Why does milk show the Tyndall effect?
Milk has fat globules that scatter light.
133. What is the boiling point of water?
The boiling point of water is 100°C at 1 atm.
134. Why is water purified by distillation?
Water boils and condenses, leaving impurities.
135. What is the solvent in a vinegar solution?
Water is the solvent in a vinegar solution.
136. Why is vinegar a solution?
Vinegar is a homogeneous mixture of acetic acid and water.
137. What is the solute in a saltwater solution?
Salt is the solute in a saltwater solution.
138. Why is saltwater a true solution?
Salt dissolves completely, forming a uniform mixture.
139. What is an aerosol?
An aerosol is a colloid with liquid or solid in a gas.
140. Why is fog an aerosol?
141. What is the dispersed phase in a gel?
Liquid is the dispersed phase in a gel.
142. Why is gelatin a gel?
Gelatin traps liquid in a solid structure.
143. What is a mixture’s physical property used for?
Physical properties are used to separate mixtures.
144. Why is boiling point used in distillation?
Boiling point differences separate liquids.
145. What is a compound’s fixed ratio?
A compound has elements in a definite proportion.
146. Why is carbon dioxide a compound?
Carbon dioxide has carbon and oxygen in a fixed ratio.
147. What is a mixture’s variable ratio?
A mixture’s components can vary in proportion.
148. Why is tea a mixture?
Tea has varying amounts of water, sugar, and tea leaves.
149. What is the solvent in a soda solution?
Water is the solvent in a soda solution.
150. Why is soda a homogeneous mixture?
Soda has a uniform composition throughout.
151. What is the solute in a tincture of iodine?
Iodine is the solute in a tincture of iodine.
152. Why is tincture of iodine a solution?
Iodine dissolves uniformly in alcohol.
153. What is a physical change in sugar?
Dissolving sugar in water is a physical change.
154. Why is dissolving a physical change?
Dissolving retains sugar’s chemical composition.
155. What is a chemical change in food?
Cooking food is a chemical change.
156. Why is cooking a chemical change?
Cooking forms new substances with different properties.
157. What is the Tyndall effect in smoke?
Smoke scatters light due to solid particles.
158. Why does a suspension not show uniformity?
Suspension particles settle, creating layers.
159. What is the solvent in a sugar syrup?
Water is the solvent in a sugar syrup.
160. Why is sugar syrup a solution?
Sugar dissolves completely in water, forming a uniform mixture.
161. What is the solute in a lemonade solution?
Sugar and lemon juice are solutes in lemonade.
162. Why is lemonade a homogeneous mixture?
Lemonade has a uniform composition throughout.
163. What is a colloid’s stability due to?
Colloid stability is due to small particle size.
164. Why does a colloid not settle?
Colloid particles are too small to settle.
165. What is a suspension’s instability due to?
Suspension instability is due to large particle size.
166. Why does a suspension settle over time?
Large particles are pulled down by gravity.
167. What is the boiling point of acetone?
The boiling point of acetone is 56°C.
168. Why is acetone separated by distillation?
Acetone has a lower boiling point than water.
169. What is a pure substance’s property like?
A pure substance has definite and constant properties.
170. Why is a mixture’s property variable?
A mixture’s properties depend on its components’ ratio.
171. What is a solution’s clarity due to?
A solution’s clarity is due to tiny particle size.
172. Why is a solution stable?
Solution particles are too small to settle.
173. What is the solvent in a brine solution?
Water is the solvent in a brine solution.
174. Why is brine a true solution?
175. What is the solute in a vinegar solution?
Acetic acid is the solute in a vinegar solution.
176. Why is vinegar a homogeneous mixture?
Vinegar has a uniform composition of acid and water.
177. What is a physical change in salt?
Dissolving salt in water is a physical change.
178. Why is dissolving salt a physical change?
Dissolving salt retains its chemical composition.
179. What is a chemical change in paper?
Burning paper is a chemical change.
180. Why is burning paper a chemical change?
Burning paper forms ash and gases, new substances.
181. What is the Tyndall effect in a gel?
A gel scatters light due to its structure.
182. Why does a gel show the Tyndall effect?
Gel particles are large enough to scatter light.
183. What is the boiling point of methanol?
The boiling point of methanol is 64.7°C.
184. Why is methanol separated by distillation?
Methanol has a lower boiling point than water.
185. What is a compound’s chemical bond like?
A compound has elements chemically bonded.
186. Why is sodium chloride a compound?
Sodium chloride has sodium and chlorine chemically bonded.
187. What is a mixture’s physical bond like?
A mixture has components physically combined.
188. Why is sand and salt a mixture?
Sand and salt are physically mixed, not bonded.
189. What is the solvent in a copper sulfate solution?
Water is the solvent in a copper sulfate solution.
190. Why is copper sulfate solution a true solution?
Copper sulfate dissolves completely, forming a uniform mixture.
191. What is the solute in a soda solution?
192. Why is soda a solution?
193. What is a physical change in wax?
Melting wax is a physical change.
194. Why is melting wax a physical change?
Melting wax changes state, not composition.
195. What is a chemical change in milk?
Souring of milk is a chemical change.
196. Why is souring milk a chemical change?
Souring milk forms new substances like lactic acid.
197. What is the Tyndall effect in an emulsion?
An emulsion scatters light due to dispersed droplets.
198. Why does mayonnaise show the Tyndall effect?
Mayonnaise has oil droplets that scatter light.
199. What is the boiling point of chloroform?
The boiling point of chloroform is 61.2°C.
200. Why is chloroform separated by distillation?
Chloroform has a lower boiling point than water.
201. What is a pure substance’s melting point like?
A pure substance has a sharp melting point.
202. Why does a mixture have a range of melting points?
A mixture’s components melt at different temperatures.
203. What is a solution’s boiling point like?
A solution’s boiling point is higher than the solvent’s.
204. Why does saltwater boil at a higher temperature?
Salt increases water’s boiling point.
205. What is the solvent in a saltwater solution?
Water is the solvent in a saltwater solution.
206. Why is saltwater a homogeneous mixture?
Salt dissolves completely, forming a uniform solution.
207. What is the solute in a sugar syrup?
Sugar is the solute in a sugar syrup.
208. Why is sugar syrup a true solution?
209. What is a physical change in ice?
Melting ice is a physical change.
210. Why is melting ice a physical change?
Melting ice changes state, not composition.
211. What is a chemical change in sugar?
Burning sugar is a chemical change.
212. Why is burning sugar a chemical change?
Burning sugar forms carbon and water, new substances.
213. What is the Tyndall effect in a sol?
A sol scatters light due to dispersed solid particles.
214. Why does paint show the Tyndall effect?
Paint has pigment particles that scatter light.
215. What is the boiling point of benzene?
The boiling point of benzene is 80°C.
216. Why is benzene separated by distillation?
Benzene has a different boiling point than other liquids.
217. What is a compound’s boiling point like?
A compound has a definite boiling point.
218. Why does a mixture boil over a range?
A mixture’s components have different boiling points.
219. What is a solution’s freezing point like?
A solution’s freezing point is lower than the solvent’s.
220. Why does saltwater freeze at a lower temperature?
Salt lowers water’s freezing point.
221. What is the solvent in a lemonade solution?
222. Why is lemonade a true solution?
Sugar and lemon juice dissolve completely in water.
223. What is the solute in a brass alloy?
Zinc is the solute in a brass alloy.
224. Why is brass a homogeneous mixture?
Brass has a uniform composition of copper and zinc.
225. What is a physical change in paper?
Cutting paper is a physical change.
226. Why is cutting paper a physical change?
Cutting paper changes shape, not composition.
227. What is a chemical change in wood?
Burning wood is a chemical change.
228. Why is burning wood a chemical change?
Burning wood forms ash and gases, new substances.
229. What is the Tyndall effect in a foam?
A foam scatters light due to gas bubbles.
230. Why does whipped cream show the Tyndall effect?
Whipped cream has bubbles that scatter light.
231. What is the boiling point of toluene?
The boiling point of toluene is 110.6°C.
232. Why is toluene separated by distillation?
Toluene has a higher boiling point than other liquids.
233. What is a pure substance’s density like?
A pure substance has a constant density.
234. Why does a mixture’s density vary?
A mixture’s density depends on its components’ ratio.
235. What is a solution’s density like?
A solution’s density depends on solute concentration.
236. Why does a sugar solution have higher density?
Sugar increases the mass per unit volume.
237. What is the solvent in a tincture of iodine?
238. Why is tincture of iodine a true solution?
Iodine dissolves completely in alcohol.
239. What is the solute in a copper sulfate solution?
240. Why is copper sulfate solution a homogeneous mixture?
Copper sulfate dissolves uniformly in water.
241. What is a physical change in clay?
Molding clay is a physical change.
242. Why is molding clay a physical change?
Molding clay changes shape, not composition.
243. What is a chemical change in food?
Digesting food is a chemical change.
244. Why is digesting food a chemical change?
Digesting food forms new substances like nutrients.
245. What is the Tyndall effect in an aerosol?
An aerosol scatters light due to dispersed particles.
246. Why does smoke show the Tyndall effect?
Smoke has solid particles that scatter light.
247. What is the boiling point of water?
248. Why is water separated by distillation?
249. What is a compound’s chemical property?
A compound’s chemical property involves its reactivity.
250. Why is water’s reactivity a chemical property?
Water reacts with substances like sodium.
251. What is a mixture’s chemical property?
A mixture retains the chemical properties of its components.
252. Why does saltwater retain salt’s properties?
Salt in saltwater is not chemically altered.
253. What is the solvent in a sugar solution?
254. Why is a sugar solution a true solution?
255. What is the solute in a vinegar solution?
256. Why is vinegar a solution?
Vinegar is a homogeneous mixture of acid and water.
257. What is a physical change in metal?
Bending metal is a physical change.
258. Why is bending metal a physical change?
Bending metal changes shape, not composition.
259. What is a chemical change in iron?
Rusting iron is a chemical change.
260. Why is rusting iron a chemical change?
261. What is the Tyndall effect in a gel?
262. Why does jelly show the Tyndall effect?
Jelly has a structure that scatters light.
263. What is the boiling point of ethanol?
264. Why is ethanol purified by distillation?
Ethanol boils at a lower temperature than water.
265. What is a pure substance’s reactivity like?
A pure substance has specific reactivity.
266. Why does a mixture’s reactivity vary?
A mixture’s reactivity depends on its components.
267. What is a solution’s reactivity like?
A solution’s reactivity depends on solute and solvent.
268. Why does saltwater react differently than water?
Salt alters the chemical properties of the solution.
269. What is the solvent in a soda solution?
270. Why is soda a true solution?
Soda has a uniform composition of dissolved substances.
271. What is the solute in a lemonade solution?
272. Why is lemonade a solution?
Lemonade is a homogeneous mixture of solutes in water.
273. What is a physical change in water?
Freezing water is a physical change.
274. Why is freezing water a physical change?
Freezing water changes state, not composition.
275. What is a chemical change in methane?
Burning methane is a chemical change.
276. Why is burning methane a chemical change?
Burning methane forms carbon dioxide and water.
277. What is the Tyndall effect in a foam?
278. Why does soap foam show the Tyndall effect?
Soap foam has bubbles that scatter light.
279. What is the boiling point of acetone?
280. Why is acetone purified by distillation?
Acetone boils at a lower temperature than water.
281. What is a compound’s composition like?
A compound has a fixed composition of elements.
282. Why is ammonia a compound?
Ammonia has nitrogen and hydrogen in a fixed ratio.
283. What is a mixture’s composition like?
284. Why is coffee a mixture?
Coffee has varying amounts of water and coffee powder.
285. What is the solvent in a brine solution?
286. Why is brine a solution?
Brine is a homogeneous mixture of salt in water.
287. What is the solute in a sugar syrup?
288. Why is sugar syrup a homogeneous mixture?
Sugar dissolves completely, forming a uniform solution.
289. What is a physical change in sugar?
Melting sugar is a physical change.
290. Why is melting sugar a physical change?
Melting sugar changes state, not composition.
291. What is a chemical change in milk?
Curdling milk is a chemical change.
292. Why is curdling milk a chemical change?
Curdling forms new substances like curd.
293. What is the Tyndall effect in an emulsion?
294. Why does cream show the Tyndall effect?
Cream has fat droplets that scatter light.
295. What is the boiling point of methanol?
296. Why is methanol purified by distillation?
Methanol boils at a lower temperature than water.
297. What is a pure substance’s boiling point like?
A pure substance has a sharp boiling point.
298. Why does a mixture boil over a range?
299. What is a solution’s boiling point like?
300. Why does a salt solution boil at a higher temperature?
Salt increases the boiling point of water.
301. What is the solvent in a vinegar solution?
302. Why is vinegar a true solution?
Vinegar has a uniform composition of acid in water.
303. What is the solute in a soda solution?
304. Why is soda a homogeneous mixture?
305. What is a physical change in ice?
Breaking ice is a physical change.
306. Why is breaking ice a physical change?
Breaking ice changes shape, not composition.
307. What is a chemical change in gasoline?
Burning gasoline is a chemical change.
308. Why is burning gasoline a chemical change?
Burning gasoline forms carbon dioxide and water.
309. What is the Tyndall effect in a sol?
310. Why does ink show the Tyndall effect?
Ink has pigment particles that scatter light.
311. What is the boiling point of chloroform?
312. Why is chloroform purified by distillation?
Chloroform boils at a lower temperature than water.
313. What is a compound’s melting point like?
A compound has a definite melting point.
314. Why does a mixture melt over a range?
315. What is a solution’s freezing point like?
316. Why does a sugar solution freeze at a lower temperature?
Sugar lowers water’s freezing point.
317. What is the solvent in a copper sulfate solution?
318. Why is copper sulfate solution a true solution?
Copper sulfate dissolves completely in water.
319. What is the solute in a saltwater solution?
320. Why is saltwater a solution?
Saltwater is a homogeneous mixture of salt in water.
321. What is a physical change in plastic?
Melting plastic is a physical change.
322. Why is melting plastic a physical change?
Melting plastic changes state, not composition.
323. What is a chemical change in coal?
Burning coal is a chemical change.
324. Why is burning coal a chemical change?
Burning coal forms ash and gases, new substances.
325. What is the Tyndall effect in a gel?
326. Why does agar show the Tyndall effect?
Agar has a structure that scatters light.
327. What is the boiling point of benzene?
328. Why is benzene purified by distillation?
Benzene boils at a different temperature than impurities.
329. What is a pure substance’s composition like?
330. Why is sulfur a pure substance?
Sulfur consists of only sulfur atoms.
331. What is a mixture’s composition like?
332. Why is fruit juice a mixture?
Fruit juice has varying amounts of water and pulp.
333. What is the solvent in a sugar syrup?
334. Why is sugar syrup a true solution?
335. What is the solute in a lemonade solution?
336. Why is lemonade a homogeneous mixture?
337. What is a physical change in glass?
Breaking glass is a physical change.
338. Why is breaking glass a physical change?
Breaking glass changes shape, not composition.
339. What is a chemical change in bread?
Baking bread is a chemical change.
340. Why is baking bread a chemical change?
Baking bread forms new substances like crust.
341. What is the Tyndall effect in an aerosol?
342. Why does mist show the Tyndall effect?
Mist has water droplets that scatter light.
343. What is the boiling point of toluene?
344. Why is toluene purified by distillation?
Toluene boils at a higher temperature than impurities.
345. What is a compound’s reactivity like?
A compound has specific reactivity based on its bonds.
346. Why is water’s reaction with sodium a chemical property?
Water forms new substances with sodium.
347. What is a mixture’s reactivity like?
348. Why does a sugar solution retain sugar’s properties?
Sugar in solution is not chemically altered.
349. What is the solvent in a saltwater solution?
350. Why is saltwater a true solution?
351. What is the solute in a vinegar solution?
352. Why is vinegar a homogeneous mixture?
353. What is a physical change in rubber?
Stretching rubber is a physical change.
354. Why is stretching rubber a physical change?
Stretching rubber changes shape, not composition.
355. What is a chemical change in oil?
Burning oil is a chemical change.
356. Why is burning oil a chemical change?
Burning oil forms carbon dioxide and water.
357. What is the Tyndall effect in a foam?
358. Why does shaving cream show the Tyndall effect?
Shaving cream has bubbles that scatter light.
359. What is the boiling point of water?
360. Why is water purified by distillation?
361. What is a pure substance’s melting point like?
362. Why does a mixture have a range of melting points?
363. What is a solution’s boiling point like?
364. Why does a sugar solution boil at a higher temperature?
Sugar increases water’s boiling point.
365. What is the solvent in a soda solution?
366. Why is soda a true solution?
367. What is the solute in a copper sulfate solution?
368. Why is copper sulfate solution a homogeneous mixture?
369. What is a physical change in wood?
Cutting wood is a physical change.
370. Why is cutting wood a physical change?
Cutting wood changes shape, not composition.
371. What is a chemical change in egg?
Cooking egg is a chemical change.
372. Why is cooking egg a chemical change?
Cooking egg forms new substances with different properties.
373. What is the Tyndall effect in an emulsion?
374. Why does butter show the Tyndall effect?
Butter has fat droplets that scatter light.
375. What is the boiling point of ethanol?
376. Why is ethanol purified by distillation?
377. What is a compound’s density like?
A compound has a constant density.
378. Why does a mixture’s density vary?
379. What is a solution’s density like?
380. Why does a salt solution have higher density?
Salt increases the mass per unit volume.
381. What is the solvent in a lemonade solution?
382. Why is lemonade a true solution?
383. What is the solute in a sugar syrup?
384. Why is sugar syrup a solution?
Sugar syrup is a homogeneous mixture of sugar in water.
385. What is a physical change in metal?
Melting metal is a physical change.
386. Why is melting metal a physical change?
Melting metal changes state, not composition.
387. What is a chemical change in magnesium?
Burning magnesium is a chemical change.
388. Why is burning magnesium a chemical change?
Burning magnesium forms magnesium oxide, a new substance.
389. What is the Tyndall effect in a sol?
390. Why does blood show the Tyndall effect?
Blood has particles that scatter light.
391. What is the boiling point of acetone?
392. Why is acetone purified by distillation?
393. What is a pure substance’s reactivity like?
394. Why does a mixture’s reactivity vary?
395. What is a solution’s reactivity like?
396. Why does a copper sulfate solution react differently than water?
Copper sulfate alters the solution’s chemical properties.
397. What is the solvent in a saltwater solution?
398. Why is saltwater a homogeneous mixture?
399. What is the solute in a vinegar solution?
400. Why is vinegar a true solution?
401. What is a physical change in paper?
Folding paper is a physical change.
402. Why is folding paper a physical change?
Folding paper changes shape, not composition.
403. What is a chemical change in sulfur?
Burning sulfur is a chemical change.
404. Why is burning sulfur a chemical change?
Burning sulfur forms sulfur dioxide, a new substance.
405. What is the Tyndall effect in a gel?
406. Why does pudding show the Tyndall effect?
Pudding has a structure that scatters light.
407. What is the boiling point of methanol?
408. Why is methanol purified by distillation?
409. What is a compound’s boiling point like?
410. Why does a mixture boil over a range?
411. What is a solution’s freezing point like?
412. Why does a salt solution freeze at a lower temperature?
413. What is the solvent in a sugar solution?
414. Why is a sugar solution a true solution?
415. What is the solute in a soda solution?
416. Why is soda a solution?
417. What is a physical change in ice?
Crushing ice is a physical change.
418. Why is crushing ice a physical change?
Crushing ice changes shape, not composition.
419. What is a chemical change in carbon?
Burning carbon is a chemical change.
420. Why is burning carbon a chemical change?
Burning carbon forms carbon dioxide, a new substance.
421. What is the Tyndall effect in an aerosol?
422. Why does spray paint show the Tyndall effect?
Spray paint has particles that scatter light.
423. What is the boiling point of benzene?
424. Why is benzene purified by distillation?
425. What is a pure substance’s density like?
426. Why does a mixture’s density vary?
427. What is a solution’s density like?
428. Why does a sugar solution have higher density?
429. What is the solvent in a lemonade solution?
430. Why is lemonade a true solution?
431. What is the solute in a sugar syrup?
432. Why is sugar syrup a homogeneous mixture?
433. What is a physical change in clay?
Shaping clay is a physical change.
434. Why is shaping clay a physical change?
Shaping clay changes form, not composition.
435. What is a chemical change in lime?
Slaking lime is a chemical change.
436. Why is slaking lime a chemical change?
Slaking lime forms calcium hydroxide, a new substance.
437. What is the Tyndall effect in a foam?
438. Why does froth show the Tyndall effect?
Froth has bubbles that scatter light.
439. What is the boiling point of toluene?
440. Why is toluene purified by distillation?
441. What is a compound’s reactivity like?
442. Why is water’s reaction with metals a chemical property?
Water forms new substances with metals.
443. What is a mixture’s reactivity like?
444. Why does a salt solution retain salt’s properties?
Salt in solution is not chemically altered.
445. What is the solvent in a vinegar solution?
446. Why is vinegar a true solution?
447. What is the solute in a saltwater solution?
448. Why is saltwater a solution?
449. What is a physical change in sugar?
Grinding sugar is a physical change.
450. Why is grinding sugar a physical change?
Grinding sugar changes size, not composition.
451. What is a chemical change in zinc?
Reacting zinc with acid is a chemical change.
452. Why is reacting zinc a chemical change?
Reacting zinc forms zinc salts, new substances.
453. What is the Tyndall effect in an emulsion?
454. Why does milk show the Tyndall effect?
455. What is the boiling point of water?
456. Why is water purified by distillation?
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