1.简单
How many millilitres are in 1 litre?
- A10,000
- B1000
- C100
- D10
2.简单
What is the change from a liquid to a solid called?
- AFreezing
- BEvaporation
- CCondensation
- DMelting
3.简单
Which functional group is found in all alcohols?
- ACarboxyl group (–COOH)
- BHydroxyl group (–OH)
- CAmino group (–NH₂)
- DCarbonyl group (C=O) only
4.中等
To which family of organic compounds does ethanol, C₂H₅OH, belong?
- AAlcohols
- BEsters
- CAlkanes
- DCarboxylic acids
5.中等
An exothermic reaction is at equilibrium. What happens if the temperature is raised?
- AThe reaction becomes endothermic
- BThe equilibrium does not change
- CThe equilibrium shifts toward the products, raising the yield
- DThe equilibrium shifts toward the reactants
6.中等
A piece of metal has a density of 8 g/cm³ and a volume of 5 cm³. What is its mass?
- A1.6 g
- B40 g
- C0.625 g
- D13 g
7.困难
下列哪一项是中和反应?
- AH₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
- BZn + CuSO₄ → ZnSO₄ + Cu
- C2H₂O → 2H₂ + O₂
- DCH₄ + 2O₂ → CO₂ + 2H₂O
8.困难
某物质在 801 °C 熔化,固态时不导电,熔融时导电。它最可能是哪类物质?
- A简单共价(分子)物质
- B金属
- C离子化合物
- D稀有气体
答案
- 1. B · 1000
- 2. A · Freezing
- 3. B · Hydroxyl group (–OH)
- 4. A · Alcohols
- 5. D · The equilibrium shifts toward the reactants
- 6. B · 40 g
- 7. A · H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
- 8. C · 离子化合物
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