2. Products.
3. Chemical change.
4. Rearrangement of bonds.
5. Breaking, or forming.
6. Atoms.
7. Missing or new.
8. Rearrange the bonds.
9. 2, 2, 1, 1.
10. 2, 1, 2.
11. Law of Conservation of Mass.
12. Cu and O atoms.
13. 2 Cu + 02 = 2 CuO.
14. Reactants: 1 Cu, 2 O- products: 2 Cu, 2 O.
15. CuO.
16. Cu, O2.
17. 2 Cu + 02 = 2CuO.
18. 1CH4 + 2O2 + 2H20+ 1CO2.
19. 1N2+ 3H2 = 2NH3.
20. 2KClO3 = 2KCl + 3O2.
21. 4Al + 3O2 = 2Al2O3.
1. Reactants and products.
2. Present before and after the reaction.
3. Coefficients, atom.
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