Across
- 3. the relative size of things
- 4. the tiny pieces that all matter is made of
- 6. a process in which atoms rearrange to form new substances
- 8. to change the order or position of something
Down
- 1. an object or diagram that helps us understand something by making it simpler
- 2. a starting substance that is part of a chemical reaction
- 3. something that is made of all the same atoms or groups of atoms
- 5. something that can be observed about a substance
- 7. an ending substance that is made during a chemical reaction