chemical reactions

2. letters and numbers showing the types and number of atoms that repeat to make up a substance
4. something that can be observed about a substance, such as color, smell, or boiling point
5. a starting substance that is part of a chemical reaction
6. the temperature at which a substance changes from the liquid phase to the gas phase
8. the relative size of things
11. able to cause damage
13. a process in which atoms rearrange to form new substances
15. the tiny pieces that all matter—all the stuff in the world—is made of
16. to change the order or position of something

1. a substance that is added to soil to help plants grow
3. a structure formed by repeating groups of atoms that link together in a large network
7. the temperature at which a substance changes from the solid phase to the liquid phase
9. an ending substance that is made during a chemical reaction
10. something that is made of all the same atoms or groups of atoms
12. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see
14. a group of atoms joined together in a particular way