Phiếu bài tập Hóa học cho kỳ thi đầu vào điều dưỡng có đáp án

Chất nào là một base?

1. ASodium hydroxide (NaOH)
2. BNước chanh (citric acid)
3. CGiấm (acetic acid)
4. DHydrochloric acid (HCl)

What is an electrolyte?

1. AA substance that dissolves as whole molecules without forming any ions
2. BA substance that forms ions and conducts electricity when dissolved in water
3. CA metal that conducts electricity as a solid
4. DA gas that dissolves in blood

According to the Arrhenius definition, what does a base produce in water?

1. AChloride ions (Cl⁻)
2. BCarbonate ions (CO₃²⁻)
3. CHydrogen ions (H⁺)
4. DHydroxide ions (OH⁻)

A solution has a pH of 2. What is its hydrogen ion concentration?

1. A1 × 10⁻² mol/L
2. B1 × 10² mol/L
3. C1 × 10⁻¹² mol/L
4. D2 mol/L

Dung dịch bão hòa là gì?

1. ADung dịch hoàn toàn không chứa dung môi
2. BDung dịch chỉ có một lượng nhỏ chất tan hòa trong nhiều dung môi
3. CDung dịch chứa lượng chất tan nhiều nhất có thể hòa tan ở nhiệt độ đó
4. DDung dịch không dẫn điện

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

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

A scuba diver breathes compressed air deep underwater. Why must the diver breathe out while swimming up to the surface?

1. AOxygen turns to liquid at the surface
2. BThe air in the lungs expands as the outside pressure falls
3. CThe water gets warmer near the surface
4. DThe air in the lungs shrinks as the outside pressure falls

A student tests whether water temperature affects how fast sugar dissolves. Which set of factors should be kept the same in every trial?

1. AThe water temperature and the dissolving time
2. BOnly the colour of the cup
3. CNothing, because changing several factors at once gives more useful data
4. DThe mass of sugar, the type of sugar, the volume of water and the amount of stirring