解答つき看護学校入学試験のための化学ワークシート

According to the kinetic molecular theory, how do gas particles move?

1. AAlways in a single direction, set by the pull of gravity
2. BOnly when heated, and then in neat lines between the walls
3. CSlowly in fixed positions
4. DConstantly, randomly and in straight lines between collisions

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

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

What is an alpha particle made of?

1. AA single high-energy electron
2. BPure electromagnetic energy
3. C1 proton and 1 electron
4. D2 protons and 2 neutrons

Why does water boil at a lower temperature at the top of a high mountain?

1. AThe air pressure is lower, so less vapour pressure is needed to boil
2. BThere is less oxygen dissolved in the water up there
3. CGravity is weaker, so the molecules escape more easily
4. DThe air is colder, so the water loses heat and boils sooner

What does Avogadro's law state?

1. AEqual volumes of gases at the same temperature and pressure contain equal numbers of molecules
2. BEqual masses of all gases contain equal numbers of molecules under any conditions
3. CThe pressure of a gas doubles when its temperature is halved
4. DOne mole of any gas has a mass of 22.4 g

On an energy diagram, the products are at a lower energy than the reactants. What kind of reaction is shown?

1. AEndothermic
2. BNuclear
3. CReversible only
4. DExothermic

Which 1-litre solution lowers the freezing point of water the most?

1. A0.5 M NaCl
2. B1 M glucose
3. C1 M NaCl
4. D1 M CaCl₂

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

1. A28%
2. B17.5%
3. C60%
4. D35%