护理入学考试化学练习卷（附答案）

Which of these is a chemical property?

1. AColour
2. BBoiling point
3. CDensity
4. DFlammability

Where do the mole ratios used in stoichiometry come from?

1. AThe coefficients of the balanced equation
2. BThe subscripts in each formula
3. CThe physical states of the substances
4. DThe molar masses of the reactants

什么是离子？

1. A由两个相同原子构成的分子
2. B与其他原子相比，原子核中多了中子的原子
3. C带有电荷的原子或原子团
4. D没有任何电子的粒子

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

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

When a nucleus emits an alpha particle, how do its mass number and atomic number change?

1. AMass number falls by 2 and atomic number falls by 4
2. BMass number falls by 4 and atomic number falls by 2
3. CNeither changes
4. DMass number stays the same and atomic number rises by 1

Which list is in order from smallest to largest mass?

1. AKilogram, gram, milligram
2. BGram, milligram, kilogram
3. CMilligram, kilogram, gram
4. DMilligram, gram, kilogram

Why does drinking seawater make dehydration worse?

1. ASeawater is hypotonic, so water rushes into cells and makes them burst
2. BSeawater is isotonic, so it cannot be absorbed
3. CSeawater is hypertonic, so the body loses extra water getting rid of the salt
4. DSeawater contains no water molecules the body can use

At the top of a high mountain, air still contains about 21% oxygen. Why do climbers still get less oxygen with each breath?

1. AOxygen is heavier, so it all sinks to sea level
2. BCold air contains no oxygen
3. CThe percentage of oxygen in the air falls sharply as you climb higher
4. DThe total air pressure is lower, so the partial pressure of oxygen is lower