护理入学考试化学练习卷（附答案）

Which two substances must be present for iron to rust?

1. AHydrogen and oxygen gas only
2. BNitrogen and water
3. CCarbon dioxide and salt
4. DOxygen and water

What is gamma radiation?

1. AHigh-energy electromagnetic radiation with no mass or charge
2. BA slow-moving electron
3. CA fast stream of protons from the nucleus
4. DA stream of helium nuclei with a positive charge

What is an acid–base indicator?

1. AA gas given off by acids
2. BA substance that changes colour depending on pH
3. CA substance that neutralises every acid
4. DA device that measures temperature

Which bond joins amino acids together in a protein?

1. AAn ionic bond
2. BA peptide bond
3. CA hydrogen bond
4. DA glycosidic bond

Why does stirring help a solid dissolve faster?

1. AIt increases the amount of solute that can dissolve in total
2. BIt brings fresh solvent into contact with the solid's surface
3. CIt turns the solid into a liquid
4. DIt raises the temperature of the solvent by friction a great deal

下列哪项描述的是吸热过程？

1. A它吸收热量，所以周围环境感觉更冷
2. B它只在非常高的温度下发生
3. C它既不吸收也不释放任何能量
4. D它释放热量，所以周围环境感觉更暖

Magnesium burns as 2Mg + O₂ → 2MgO. What mass of MgO (40 g/mol) forms from 48 g of Mg (24 g/mol)?

1. A160 g
2. B40 g
3. C80 g
4. D48 g

A mixture contains sand, salt and water. Which sequence separates all three?

1. ADistil first to remove the sand, then filter out the salt
2. BEvaporate all the water first, then filter the salt away from the dry sand
3. CFilter to remove the sand, then distil the filtrate to collect water and leave salt
4. DUse a magnet to remove the salt, then filter the sand