1. Reactants.
2. Products
3. Chemical Change.
4. Rearrangement.
5. Breaking, forming.
6. Atoms
7. Missing, new.
8. Rearrange the bonds.
9. 2, 2, 1, 1.
10. 2, 1, 2
11. Law of Conservation of Mass
12. Atoms, Atoms
13. 2, 1, 2
14. R: 1, 2. P: 1, 1.
15. CuO, Cu
16. O, Cu, Cu
17. 2, 1, 2
18. 1, 2, 2, 1
19. 1, 3, 2
20. 2, 2, 3
21. 4, 3, 2
Summary.
1. Breaking old bonds and forming new ones or both.
2. Present before the reaction starts and when the reaction ends.
3. what, how many.
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