1.简单
According to collision theory, what must happen for particles to react?
- AThey must have the same mass
- BThey must both be in the solid state at the same time
- CThey must collide with enough energy and the right orientation
- DThey must stay completely still next to each other
2.简单
What are enzymes?
- ASugars that store energy in the liver
- BMinerals that build bone
- CBiological catalysts, usually proteins
- DFats that form most of the cell membrane
3.简单
What is oxidation, in terms of electrons?
- ALoss of protons
- BGain of neutrons
- CLoss of electrons
- DGain of electrons
4.中等
Vinegar contains acetic acid, CH₃COOH. Which functional group makes it an acid?
- AThe amino group, –NH₂
- BThe methyl group, –CH₃
- CThe carboxyl group, –COOH
- DThe hydroxyl group of an alcohol, –OH
5.中等
AgNO₃ + NaCl → AgCl + NaNO₃ 是哪种类型的反应?
- A燃烧反应
- B分解反应
- C复分解反应
- D置换反应
6.中等
哪组系数能配平方程式 __H₂ + __O₂ → __H₂O?
- A2, 1, 2
- B2, 2, 2
- C1, 1, 1
- D1, 2, 1
7.困难
配平方程式 __C₃H₈ + __O₂ → __CO₂ + __H₂O。O₂ 的系数是多少?
- A4
- B5
- C10
- D3
8.困难
对于这样小的分子来说,水的沸点为什么异常地高?
- A它是离子化合物
- B必须破坏其分子之间强的氢键
- C它的分子非常重
- D沸腾时它的 O–H 键断裂
答案
- 1. C · They must collide with enough energy and the right orientation
- 2. C · Biological catalysts, usually proteins
- 3. C · Loss of electrons
- 4. C · The carboxyl group, –COOH
- 5. C · 复分解反应
- 6. A · 2, 1, 2
- 7. B · 5
- 8. B · 必须破坏其分子之间强的氢键
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