护理入学考试化学练习卷（附答案）

What does the subscript 2 in H₂O tell you?

1. AEach molecule contains two hydrogen atoms
2. BThere are two water molecules
3. CEach molecule contains two oxygen atoms
4. DWater has a charge of 2

In a solution, what is the solvent?

1. AAny solid that will not dissolve, however long it is stirred
2. BThe substance that does the dissolving, usually present in the larger amount
3. CThe gas given off when a solid dissolves
4. DThe substance that is dissolved, usually present in the smaller amount

Which of these is a polyatomic ion?

1. ASulfate, SO₄²⁻
2. BSodium, Na⁺
3. COxide, O²⁻
4. DChloride, Cl⁻

Uranium-235 and uranium-238 both have 92 protons. How many more neutrons does an atom of uranium-238 have?

1. A0
2. B3
3. C92
4. D146

Which assumption is made about an ideal gas?

1. AIts particles lose energy in every collision
2. BIts particles stay still at room temperature
3. CIts particles have no attraction to each other
4. DIts particles are large, closely packed and strongly attracted

一个镁原子失去两个电子。形成的离子是什么？

1. AMg⁻
2. BMg²⁻
3. CMg⁺
4. DMg²⁺

一个葡萄糖分子 C₆H₁₂O₆ 中有多少个原子？

1. A3
2. B72
3. C24
4. D18

Why is incomplete combustion of fuel in a poorly ventilated room dangerous?

1. AIt produces extra oxygen, which damages the lining of the lungs over time
2. BIt produces carbon monoxide, which binds to haemoglobin and blocks oxygen transport
3. CIt produces nitrogen, which replaces oxygen in the blood
4. DIt produces water vapour, which is toxic