1.简单
一种溶液的 pH 为 3。应如何描述它?
- A饱和
- B中性
- C酸性
- D碱性
2.简单
In a chemical reaction, what is the limiting reactant?
- AThe reactant that is left over at the end
- BThe reactant that runs out first and stops the reaction
- CThe reactant with the largest mass
- DThe catalyst that controls the speed
3.简单
反应 A + B → AB 表示哪种类型的反应?
- A分解反应
- B合成(化合)反应
- C燃烧反应
- D置换反应
4.中等
Which list is in order from smallest to largest mass?
- AMilligram, gram, kilogram
- BGram, milligram, kilogram
- CKilogram, gram, milligram
- DMilligram, kilogram, gram
5.中等
How many grams are in 2.5 kg?
- A0.0025 g
- B2500 g
- C250 g
- D25 g
6.中等
将 2 摩尔葡萄糖溶于水,配成 4 升溶液。摩尔浓度是多少?
- A2 M
- B0.5 M
- C4 M
- D8 M
7.困难
用最小的整数配平 __Fe + __O₂ → __Fe₂O₃。系数是多少?
- A2, 1, 1
- B4, 3, 4
- C2, 3, 1
- D4, 3, 2
8.困难
10 g 某物质溶于水,配成 250 mL 溶液。它的浓度是多少 g/L?
- A2.5 g/L
- B0.04 g/L
- C40 g/L
- D25 g/L
答案
- 1. C · 酸性
- 2. B · The reactant that runs out first and stops the reaction
- 3. B · 合成(化合)反应
- 4. A · Milligram, gram, kilogram
- 5. B · 2500 g
- 6. B · 0.5 M
- 7. D · 4, 3, 2
- 8. C · 40 g/L
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