护理入学考试化学练习卷（附答案）

What are the units of molarity?

1. AMoles of solute per litre of solution (mol/L)
2. BGrams of solute per 100 g of solution
3. CGrams of solute per litre of solution (g/L)
4. DMoles of solute per kilogram of the solvent used

Which unit is commonly used for the density of a liquid?

1. AmL/g
2. Bg·mL
3. Ckg
4. Dg/mL

What is an alloy?

1. AA compound formed when a metal reacts with oxygen
2. BA mixture of a metal with one or more other elements
3. CA pure metal in its natural state
4. DA nonmetal that conducts electricity

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

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

A student tests how temperature affects the rate of a reaction. What is the independent variable?

1. AThe reaction rate
2. BThe volume of acid, which is kept the same
3. CThe type of beaker used
4. DThe temperature

哪种改变会使一块粉笔与酸反应得更快？

1. A把粉笔研磨成粉末
2. B使用一大块粉笔
3. C把酸放进冰箱冷却
4. D用更多水稀释酸

In the Bohr model, what happens when an electron drops from a higher energy level to a lower one?

1. AThe electron leaves the atom
2. BThe atom gains a proton
3. CEnergy is released, often as light
4. DEnergy is absorbed from the surroundings

An unknown element is shiny, conducts electricity, and reacts vigorously with water to form a basic solution and hydrogen gas. In which group is it most likely?

1. AGroup 1 (alkali metals)
2. BGroup 18 (noble gases)
3. CGroup 17 (halogens)
4. DGroup 14 (carbon group)