Chemical reactions

2. the relative size of things
6. a starting substance that is part of a chemical reaction
7. something that is made of all the same atoms or groups of atoms
10. a substance that is added to soil to help plants grow
12. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see
14. to change the order or position of something
15. the tiny pieces that all matter—all the stuff in the world—is made of
16. a group of atoms joined together in a particular way

1. the temperature at which a substance changes from the solid phase to the liquid phase
3. letters and numbers showing the types and number of atoms that repeat to make up a substance
4. structure a structure formed by repeating groups of atoms that link together in a large network
5. able to cause damage
8. the temperature at which a substance changes from the liquid phase to the gas phase
9. a process in which atoms rearrange to form new substances
11. something that can be observed about a substance, such as color, smell, or boiling point
13. an ending substance that is made during a chemical reaction