The Particulate Nature of Matter

2. The ability of a substance (物质) to become smaller in volume (体积) when pressure (压力) is applied.
4. A pure substance (纯净物) made of only one type of atom (原子).
5. The ability to do work (做功) or cause change (变化).
8. A particle with an electric charge (电荷) because it gained or lost electrons (电子).
12. When a solid (固体) changes directly into a gas (气体) without becoming a liquid.
13. The amount of mass (质量) in a certain volume (体积) of a substance (物质).
15. When a gas (气体) changes into a liquid (液体) because it loses heat (热量).
16. The amount of space (空间) an object or substance (物质) takes up.
19. Two or more atoms (原子) chemically bonded (化学键结合) together.

1. Energy an object has because it is moving (运动).
3. A very small piece of matter (物质), such as an atom (原子) or molecule (分子).
4. When a liquid (液体) changes into a gas (气体), usually from the surface (表面).
6. Stored energy (储存的能量) because of an object’s position (位置) or structure (结构).
7. When a gas (气体) changes directly into a solid (固体) without becoming a liquid.
9. When a solid (固体) becomes a liquid (液体) because it gains heat (热量).
10. Anything that has mass (质量) and takes up space (空间).
11. The different forms of matter (物质), such as solid (固体), liquid (液体), and gas (气体).
14. When a liquid (液体) becomes a solid (固体) because it loses heat (热量).
17. The amount of matter (物质) in an object.
18. A substance (物质) made of two or more different elements (元素) chemically bonded (化学键结合).