1.简单
酸和碱相互中和时产生什么?
- A金属和氢气
- B盐和水
- C更强的酸
- D只有二氧化碳
2.简单
What colour does blue litmus paper turn in an acid?
- AGreen
- BBlue (no change)
- CRed
- DPurple
3.简单
Between which kinds of elements do ionic bonds usually form?
- ATwo noble gases
- BTwo nonmetals
- CA metal and a nonmetal
- DTwo identical metals
4.中等
由 15 g 盐和 135 g 水配成的溶液中,盐的质量分数是多少?
- A10%
- B90%
- C15%
- D11%
5.中等
关于同一族的元素,下列哪项说法正确?
- A它们的价电子数相同,化学性质相似
- B它们在室温下总是全部是气体
- C它们的原子质量相同,质子数相同
- D它们的电子层数相同,但性质不同
6.中等
根据分子动理论,温度衡量的是什么?
- A容器的大小
- B粒子的平均动能
- C粒子的总数
- D每个粒子的质量
7.困难
Which statement correctly distinguishes a scientific law from a scientific theory?
- ALaws apply only to chemistry, theories only to biology
- BA law is only a guess, while a theory is a proven fact
- CA law describes what happens; a theory explains why it happens
- DA theory becomes a law once it is proved
8.困难
Methane (CH₄) has four bonding pairs and no lone pairs on carbon. What is its shape?
- ATrigonal pyramidal
- BBent
- CTetrahedral
- DSquare planar
答案
- 1. B · 盐和水
- 2. C · Red
- 3. C · A metal and a nonmetal
- 4. A · 10%
- 5. A · 它们的价电子数相同,化学性质相似
- 6. B · 粒子的平均动能
- 7. C · A law describes what happens; a theory explains why it happens
- 8. C · Tetrahedral
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