Chemical Reaction

3. letters and numbers showing the types and number of atoms that repeat to make up a substance
4. the temperature at which a substance changes from the solid phase to the liquid phase
6. something that can be observed about a substance, such as color, smell, or boiling point
7. the tiny pieces that all matter—all the stuff in the world—is made of
9. an ending substance that is made during a chemical reaction
13. able to cause damage
14. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see
15. a process in which atoms rearrange to form new substances
16. the relative size of things

1. a starting substance that is part of a chemical reaction
2. to change the order or position of something
5. a structure formed by repeating groups of atoms that link together in a large network
8. something that is made of all the same atoms or groups of atoms
10. a group of atoms joined together in a particular way
11. a substance that is added to soil to help plants grow
12. the temperature at which a substance changes from the liquid phase to the gas phase