Chemical Reactions

5. a group of atoms joined together in a particular way
8. a process in which atoms rearrange to form new substances
11. something that is made of all the same atoms or groups of atoms
12. an ending substance that is made during a chemical reaction
13. a structure formed by repeating groups of atoms that link together in a large network
14. letters and numbers showing the types and number of atoms that repeat to make up a substance
15. able to cause damage
16. a starting substance that is part of a chemical reaction

1. the tiny pieces that all matter—all the stuff in the world—is made of
2. the temperature at which a substance changes from the liquid phase to the gas phase
3. the relative size of things
4. a substance that is added to soil to help plants grow
6. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see
7. to change the order or position of something
9. something that can be observed about a substance, such as color, smell, or boiling point
10. the temperature at which a substance changes from the solid phase to the liquid phase