2. products
3. chemical change has happened
4. rearrangement of bonds
5. breaking and forming
6. same atoms
7. missing or new
8. rearrange the bonds
9. 2,1,1,1
a. hydrogen and oxygen
b. 4 and 2
10.
11. Law of Conservation of Mass
12. atoms and masses
13. 2, 1, 2CuO
14. 1,2 and 2,2
15. 1, oxygen
16. oxygen, Cu, Cu
17. 2,2,2,2
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 bonds.
2. All of the same atoms and thus the same mass before and after a reaction.
3. Coefficients and atoms.
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