Across
- 3. If you can't build a real airplane you might build a _____ airplane.
- 4. Atoms join together to make _________
- 6. Something that can be observed about a substance.
- 9. The relative size of things.
- 12. A weapon is very _________
- 14. To change the order or position of something
- 16. This helps to grow plants.
Down
- 1. An ending substance that is made in a chemical reaction.
- 2. It is what atoms do to form new substances
- 5. A structure formed by repeating groups of atoms linked together in a larger network.
- 7. Something that is made of all the same atoms or groups of atoms.
- 8. The formula that makes up any substance.
- 10. When a substance changes from a solid to a liquid.
- 11. everything in the world is made up of _____
- 13. The ______ _____ of water is 100 degrees Celsius
- 15. a starting substance that is part of a chemical reaction.