Phases of Matter

3. How easily a substance reacts with other substances to form something new.
6. Different forms a substance can exist in, such as solid, liquid, or gas, depending on temperature and pressure.
8. A measure of how acidic a substance is; acidic substances have a low pH and often taste sour.
10. A characteristic of a substance that can be observed or measured.
11. The temperature at which a solid changes into a liquid.
12. The amount of mass in a given volume; how tightly matter is packed together.

1. The ability of a substance to burn or catch fire.
2. A solid that forms when two solutions are mixed and a substance comes out of the solution.
4. The temperature at which a liquid changes into a gas.
5. A measure of how basic a substance is; basic substances have a high pH and can feel slippery.
7. The ability of a substance to dissolve in another substance, usually a liquid.
9. The study of matter, its properties, and how substances change and react.