Science: PBL3 by Evan

3. The change of state from a solid to a liquid, typically by adding heat.
5. The change of state from a liquid to a gas at a temperature below its boiling point.
6. pressure The force exerted by gas particles on the walls of their container due to their random motion and collisions.
9. A substance that provides oxygen to support combustion.
12. A chemical reaction between a fuel and an oxidizer that produces heat, light, and often flames.
13. One of the three states of matter characterized by particles that are close together but can move past one another.
14. A substance or compound used to produce specific colors in fireworks.

1. The process by which an electron absorbs energy and moves to a higher energy level.
2. The change of state from a liquid to a solid, typically by removing heat.
4. One of the three states of matter characterized by widely spaced particles that move freely in all directions.
7. The change of state from a solid directly to a gas without passing through the liquid state.
8. The change of state from a gas directly to a solid without passing through the liquid state.
10. The change of state from a gas to a liquid by cooling or increasing pressure.
11. One of the three states of matter characterized by particles that are tightly packed together and vibrate in fixed positions.
15. agent A substance that donates electrons to another substance, causing it to be reduced.