护理入学考试化学练习卷（附答案）

化学中的摩尔是什么？

1. A按标度恰好一个碳-12 原子的克数质量
2. B原子中的质子数
3. C一升任何气体的体积
4. D含有 6.02 × 10²³ 个粒子的物质的量

Plants absorb energy from sunlight during photosynthesis. How is photosynthesis classified?

1. AExothermic
2. BEndothermic
3. CNuclear
4. DNeutralisation

Which mixture is a suspension?

1. ASalt dissolved in water
2. BOxygen dissolved in water
3. CSugar dissolved in water
4. DSand stirred into water

Which property stays the same whether you have a small sample or a large sample of a pure substance?

1. AVolume
2. BTotal heat content
3. CMass
4. DDensity

When mercury(II) oxide is heated, it reacts as 2HgO → 2Hg + O₂. What type of reaction is this?

1. ACombustion
2. BSingle replacement
3. CSynthesis
4. DDecomposition

What is the oxidation number of an element in its uncombined (elemental) form, such as Fe or O₂?

1. AIt equals the group number
2. B0
3. C+1
4. D−1

A compound is a gas at room temperature, does not conduct electricity in any state, and is made of two nonmetals. What kind of substance is it most likely?

1. AA giant covalent network solid
2. BA simple molecular (covalent) substance
3. CAn ionic compound (a lattice of ions)
4. DA metal with delocalised electrons

Why does a burn from steam at 100 °C usually cause more damage than one from liquid water at 100 °C?

1. ALiquid water cannot pass any of its heat to the skin
2. BSteam particles are hotter than water particles at the same reading
3. CSteam releases a large amount of extra energy as it condenses on the skin
4. DSteam carries dissolved acid that damages the skin