2. Products
3. chemical change
4. rearrangement
5. breaking, forming
6. same atoms
7. missing, new atoms
8. rearrange the bonds
9. 2, 1, 1, 1
A. Cu, O2, CuO
B. 1 Cu and 2 O, 1 Cu and 1 O
10. 2, 1, 2
Number of atoms in reactants- 4, 2
Element- H, O
number of atoms in product- 4, 2
11. The Law of Conservation of Mass
12. mass, atoms
13. 2, 1, 2
14. 1, 2, 1 , 1
15. Cuo, Cu
16. O, Cu, Cu
17. 2, 2, 2
18. 1, 2, 2, 3
19. 2, 3, 2
20. 2, 2, 3
21. 2, 3, 1
SUMMARY:
1. The breaking or joining of different atoms.
2. the same mass
3. number of atoms, atom
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