Across
- 5. matter is not created or destroyed during a chemical reaction — it only changes form.
- 8. a state of matter that has a definite shape and volume. The particles are packed closely together.
- 9. a state of matter that flows and takes the shape of its container, but keeps the same amount of space.
- 10. the smallest group of atoms that make up a substance. Molecules are so tiny that we cannot see them, but everything around us is made of them.
Down
- 1. a chemical reaction in which a substance burns by reacting with oxygen. It releases energy in the form of heat and light.
- 2. Vapor water in its gas form. It is an invisible gas in the air that forms when liquid water is heated and changes into a gas.
- 3. Reaction a process where substances change into new substances with different properties.
- 4. A state of matter that spreads out to fill all available space. The particles move freely and are far apart.
- 6. the force of something pushing on a surface.
- 7. to change from a liquid into a gas. For example, when water is heated and turns into water vapor.