ChemThink Reactions Tutorial Questions.

1. reactants
2. products
3. chemical reaction
4. rearrangement
5. breaking, forming
6. atoms
7. missing or new
8. rearrange the bonds
9a. 2
9b. 2
9c. 1
9d. 1
10a. 2
10b. 1
10c. 2

#of Elements in reactants Elements #of atom products
4 H 4
2 O 2

11. Law of conservation of mass
12. mass, atoms
13a. 2
13b. 1
13c. 2
14a. (Cu reactant) 1
14b. (O reactant) 2
14c. (Cu product) 1
14d. (O product) 1

15. CuO, O
16. O, Cu
17. 2, 1, 2

Reactants Products
Cu-2 Cu-2
O-2 O-2

18. CH4- 1
O2-2
H2O- 2
CO2- 1

19. N2- 1
H2- 3
NH3- 2

20. KCIO3-2
KCI-2
O2-3

21. AI-4
O2-3
AI2O3-2

Summary

1. breaking bonds, making bonds, or both
2. present before and after the reaction
3. coefficients, atom