Chemical reactions

4. The starting substances in a chemical reaction
6. The product in this reaction: carbon + oxygen
9. Type of reaction in which you cannot get back the substances you started with
10. A substance made of two or more atoms chemically joined together
11. A chemical _____ shows how many atoms of each elements are in a compound
12. A possible source of danger
15. A change which transfers energy to the surroundings

1. A chemical reaction with oxygen that gives out light and heat
2. A possible source of danger
3. A chemical reaction in which a compound breaks down into simpler parts
5. A change which transfers energy from the surroundings
7. A common name for the reaction described in clue 1 down
8. When observing a chemical reaction, you might feel the chemicals change in _____.
10. A change in which atoms are rearranged to create a new substance(s)
13. The resulting substances in a chemical reaction
14. When a chemical reaction occurs, _____ is transferred to or from the surroundings