护理入学考试化学练习卷（附答案）

What is the formula of methane, the main gas in natural gas?

1. AC₂H₆
2. BCH₂
3. CCH₄
4. DCO₂

How does increasing the concentration of a reactant in solution usually affect the reaction rate?

1. AThe rate decreases
2. BThe reaction stops
3. CThe rate stays the same
4. DThe rate increases

Which of these is a polyatomic ion?

1. AOxide, O²⁻
2. BSulfate, SO₄²⁻
3. CChloride, Cl⁻
4. DSodium, Na⁺

氯-37 的原子有 17 个质子。它有多少个中子？

1. A17
2. B54
3. C37
4. D20

In a reaction at equilibrium, a product is continuously removed. What happens?

1. AThe equilibrium shifts to the left to form more reactants
2. BThe reactants run out immediately
3. CThe reaction rate drops to zero
4. DMore product keeps forming as the equilibrium shifts to the right

How does an antacid tablet relieve heartburn caused by excess stomach acid?

1. AIt coats the stomach and stops all acid production
2. BAn acid in it lowers the stomach pH further
3. CA weak base in it neutralises some of the acid
4. DIt turns the acid into a gas that is absorbed

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?

1. AIt stays exactly 7.40, because CO₂ does not affect pH
2. BIt falls, because oxygen is an acid
3. CIt rises, because less CO₂ means fewer H⁺ ions
4. DIt falls, because less CO₂ means more H⁺ ions

Sulfuric acid reacts with sodium hydroxide: H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O. How many moles of NaOH neutralise 0.5 mol of H₂SO₄?

1. A0.25 mol
2. B2 mol
3. C1 mol
4. D0.5 mol