Science

2. a simple substance that cannot be broken down into smaller parts or changed into another substance
7. the action or process of observing something or someone carefully or in order to gain information
8. a region of material that is chemically uniform, physically distinct, and often mechanically separable.
12. a process in which atoms rearrange to form new substances
13. The temperature at which a substance changes from the liquid phase to the gas phase
14. a starting substance that s part of a chemical reaction
15. the relative size of things

1. able to cause damage
3. The temperature at which a substance changes from the solid phase to the liquid phase
4. something that is made of all the same atoms or groups of atoms
5. 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
8. an ending substance that is made during a chemical reaction
9. letters and numbers showing the types and numbers of atoms that repeat to make up a substance
10. The tiny piece that all matter- all the stuff in the world- is made of
11. To smell like a scientist.