ChemThink; Chemical Reactions

1. Reactants
2. Products
3. Chemical Change
4. Rearrangement
5. Breaking; forming
6. Atoms
7. Missing; new atoms
8. Rearrange the bonds
9. 2 atoms of H; 2 atoms of O; 1 molecule of H2O; 1 atom of O
10. 2 atoms of H2; 1 atom of O2 ; 2 molecules H2O

# of atoms in Reactants; Element; # of atoms in Products
4; H; 4
2; O; 2

11. Law of Conservation of Mass

12. mass; atoms

13. 2 Cu; 1 O2; 2 CuO

14. Reactants: Cu atoms, 1; O atoms, 2

Products: Cu atoms, 1; O atoms, 1

15. one CuO; oxygen

16. O; Cu; Cu

17. 2 Cu; 1 O2; 2CuO

#Cu atoms 2= #Cu atoms 2

# O atoms 2= # O atoms 2

18. 1 molecule CH4; 2 molecules O2; 2 molecules H2O; 1 molecule CO2

19. 1 molecule N2; 3 molecules H2; 2 molecules NH3

20. 2 molecules KClO3; 2 molecules KCl; 3 molecules O2

21. 2 atoms Al; 3 molecules O2; 2 molecules Al2O3

Summary:

1) breaking chemical bonds; forming new ones; or both.

2) present before and after the reaction.

3) coefficients; atoms