Chemical Reactions

4. chemical reactions ___ substances into other substances
5. gas required for burning
6. chemical reaction absorbing light energy to produce glucose and oxygen from carbon dioxide and water
9. reactions that produce energy
10. endothermic reactions result in ___ temperatures
14. mass of products is ___ to mass of reactants in a chemical reaction
16. chemical reactions follow the law of ___ of mass
17. reactions that absorb energy
18. observation that a chemical reaction might have occurred
19. burning is a reaction indicated by the production of this form of energy

1. you see these when a gas is produced
2. energy used to break apart water into oxygen and hydrogen during electrolysis
3. ripping paper is an example of a ___ change
5. rotting garbage is a chemical reaction that produces a change in ___
7. burning is a chemical reaction that requires a ___ and oxygen.
8. substance before a chemical reaction
11. burning paper is an example of a ___ change
12. exothermic reactions result in ___ temperatures
13. substance after a chemical reaction
15. parts of molecules that break apart and rearrange during chemical reactions