Chemical Reactions

4. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see
6. a process in which atoms rearrange to form new substances
9. the tiny pieces that all matter—all the stuff in the world—is made of
10. a group of atoms joined together in a particular way
13. to change the order or position of something
14. a substance that is added to soil to help plants grow
15. the temperature at which a substance changes from the solid phase to the liquid phase

1. the temperature at which a substance changes from the liquid phase to the gas phase
2. something that is made of all the same atoms or groups of atoms
3. a structure formed by repeating groups of atoms that link together in a large network
5. an ending substance that is made during a chemical reaction
6. letters and numbers showing the types and number of atoms that repeat to make up a substance
7. the relative size of things
8. something that can be observed about a substance, such as color, smell, or boiling point
11. able to cause damage
12. a starting substance that is part of a chemical reaction