Chemistry

2. is a reaction in which energy is absorbed
6. is a characteristic of a substance that describes its ability to change into other substances
10. the cells in your body contain biological catalysts
11. when the reaction is complete, you have new substances call...
12. is any change that alters the form or appearance of a substance but does not make it into another substance
15. the study of matter and how matter changes
16. minimum amount of energy to start a chemical reaction
18. the substances you have at the beginning are called...
19. is a number placed in front of a chemical formula in an equation
20. the amount of a substance in a given volume
21. mass that is conserved in chemical reactions
22. breaks down compounds into simpler products When a substance in complete you have a new substance called---

1. an easy way to show a chemical reaction using symbols instead of words
3. a reaction that releases energy in the form of heat
4. when two or more elements or compounds combine to make a complex substance
5. matter can enter from or escape to the surroundings
7. a material that increases the rate of a reaction by lowering the activstion
8. a change in matter that produces one or more new substances in a chemical
9. when two different elements switch places
13. anything that has mass and takes up space
14. is a characteristic of a substance that can be observed without changing the substance into another substance
17. matter is not allowed to enter or leave