Chemical Reactions

4. letters and numbers showing the types and number of atoms that repeat to make up a substance
5. a group of atoms joined together in a particular way
10. a process in which atoms rearrange to form new substances
12. the tiny pieces that all matter—all the stuff in the world—is made of
16. a structure formed by repeating groups of atoms that link together in a large network

1. an ending substance that is made during a chemical reaction
2. the relative size of things
3. the temperature at which a substance changes from the liquid phase to the gas phase
6. a substance that is added to soil to help plants grow
7. to change the order or position of something
8. something that can be observed about a substance, such as color, smell, or boiling point
9. a starting substance that is part of a chemical reaction
11. able to cause damage
13. the temperature at which a substance changes from the solid phase to the liquid phase
14. something that is made of all the same atoms or groups of atoms
15. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see