护理入学考试化学练习卷（附答案）

What are the building blocks of carbohydrates such as starch?

1. AAmino acids
2. BNucleotides
3. CFatty acids joined to a glycerol molecule
4. DMonosaccharides (simple sugars) such as glucose

Which type of radiation is the most penetrating?

1. AAlpha particles
2. BBeta particles
3. CGamma rays
4. DThey are all equally penetrating

What does the rate of a reaction measure?

1. AHow much energy the final products contain
2. BHow hot the reaction gets
3. CHow quickly reactants are used up or products are formed
4. DHow much product forms in total by the end

Why do group 1 metals such as sodium react so easily?

1. ATheir nuclei contain no neutrons
2. BThey have one outer electron that is easily lost
3. CThey easily gain one extra electron
4. DThey have a full outer shell of electrons

Why does the vapour pressure of a liquid increase as it is heated?

1. AMore molecules have enough energy to escape into the gas phase
2. BThe liquid's volume decreases and squeezes out vapour
3. CThe molecules become heavier and press harder on the surface
4. DThe attractions between the molecules become stronger

On an energy diagram, the products are at a lower energy than the reactants. What kind of reaction is shown?

1. AExothermic
2. BNuclear
3. CReversible only
4. DEndothermic

Why are the radioactive tracers used for medical imaging usually chosen to have short half-lives?

1. AThey give a strong signal for imaging but leave the body's tissues exposed only briefly
2. BThey emit only alpha particles, which are harmless inside the body
3. CThey stay active for many years, so a single dose can be used for every future scan
4. DShort half-life isotopes are not radioactive

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

1. A1 mol
2. B0.25 mol
3. C2 mol
4. D0.5 mol