1.简单
哪些亚原子粒子存在于原子核中?
- A电子和中子
- B质子和电子
- C质子和中子
- D只有电子
2.简单
Which of these is a chemical property?
- AColour
- BBoiling point
- CDensity
- DFlammability
3.简单
原子中哪种粒子带正电荷?
- A光子
- B电子
- C中子
- D质子
4.中等
哪组系数能配平方程式 __H₂ + __O₂ → __H₂O?
- A2, 2, 2
- B1, 2, 1
- C2, 1, 2
- D1, 1, 1
5.中等
What colour is phenolphthalein indicator in a basic solution?
- AYellow
- BPink
- CBlue
- DColourless
6.中等
Rubbing alcohol evaporates faster than water at room temperature. What does this suggest?
- AIts molecules are heavier than water molecules
- BIts intermolecular forces are weaker than water's
- CIt has a higher boiling point than water
- DIts intermolecular forces are stronger than water's
7.困难
CO₂ in blood forms carbonic acid: CO₂ + H₂O ⇌ H₂CO₃ ⇌ H⁺ + HCO₃⁻. An anxious patient hyperventilates and breathes off extra CO₂. What happens to blood pH?
- AIt stays exactly 7.40, because CO₂ does not affect pH
- BIt falls, because oxygen is an acid
- CIt rises, because less CO₂ means fewer H⁺ ions
- DIt falls, because less CO₂ means more H⁺ ions
8.困难
一个样品含有 3.01 × 10²³ 个水分子。这是多少摩尔?
- A3.01 mol
- B0.5 mol
- C1.81 mol
- D2 mol
答案
- 1. C · 质子和中子
- 2. D · Flammability
- 3. D · 质子
- 4. C · 2, 1, 2
- 5. B · Pink
- 6. B · Its intermolecular forces are weaker than water's
- 7. C · It rises, because less CO₂ means fewer H⁺ ions
- 8. B · 0.5 mol
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