护理入学考试化学练习卷（附答案）

酸和碱相互中和时产生什么？

1. A更强的酸
2. B金属和氢气
3. C只有二氧化碳
4. D盐和水

In a solution, what is the solvent?

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

How many millilitres are in 1 litre?

1. A10,000
2. B100
3. C1000
4. D10

When the diaphragm contracts and the chest cavity gets bigger, what happens to the air pressure inside the lungs?

1. AIt falls, so air flows out
2. BIt rises, so air flows in
3. CIt does not change
4. DIt falls, so air flows in

在刚性密闭容器中加热气体时，其压强会怎样？

1. A降为零
2. B不变
3. C增大
4. D减小

What are isomers?

1. AMolecules that contain the same number of bonds
2. BCompounds with the same structure but different molecular formulas
3. CCompounds with the same molecular formula but different structures
4. DAtoms of the same element with different numbers of neutrons

What is the percentage by mass of nitrogen in ammonium nitrate, NH₄NO₃ (N = 14, H = 1, O = 16; molar mass 80 g/mol)?

1. A60%
2. B17.5%
3. C35%
4. D28%

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

1. AThey emit only alpha particles, which are harmless inside the body
2. BThey give a strong signal for imaging but leave the body's tissues exposed only briefly
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