护理入学考试化学练习卷（附答案）

What is the SI unit of pressure?

1. AJoule (J)
2. BPascal (Pa)
3. CLitre (L)
4. DNewton (N)

In a chemical equation, what are the reactants?

1. AThe catalysts written above the arrow
2. BThe new substances formed, written to the right of the arrow
3. CThe numbers written in front of each formula
4. DThe starting substances, written to the left of the arrow

Which is a sign that a chemical reaction may have taken place?

1. AWater freezes into ice when put in a freezer
2. BSugar dissolves completely when stirred into water
3. CA gas is produced when two liquids are mixed
4. DA block of wax melts when it is heated

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

A patient's arterial blood pH is 7.25. How is this described?

1. AAlkalosis
2. BNormal
3. CAcidosis
4. DNeutral

An exothermic reaction is at equilibrium. What happens if the temperature is raised?

1. AThe reaction becomes endothermic
2. BThe equilibrium shifts toward the reactants
3. CThe equilibrium shifts toward the products, raising the yield
4. DThe equilibrium does not change

Water is split as 2H₂O → 2H₂ + O₂. What volume of O₂ at STP (0 °C and 1 atm) forms from 2 mol of water?

1. A67.2 L
2. B11.2 L
3. C22.4 L
4. D44.8 L

A gas occupies 4 L at 2 atm and 200 K. What is its volume at 1 atm and 400 K?

1. A8 L
2. B16 L
3. C1 L
4. D4 L