1. Reactors
2. Products
3. Chemical Change
4. rearrangement of the bonds
5. Breaking, Forming
6. Same atoms
7. Missing, New atoms
8. Rearrange the bonds
9. two, one, one, one
10. four H, four H, two O, two O
11. Law of Conservation of Mass
12. mass, atoms
13. 2Cu+ 1O2= 2CuO
14. Reactants= 1 Cu atom, 2 O atoms, Products= 1 Cu atom, 1 O atom
15. Oxygen, Oxygen
16. Oxygen, Cu, Cu
17. 2 Cu+ 1 O2= 2 CuO
18. 1 CH4 + 2 O2= 2 H2O + 1 CO2
19. 1 N2 + 3 H2 = 2 NH3
20. 2 KCI3 = 2 KCI + 3O2
21. 4AI + 3O2 = 2AI2O3
SUMMARY
1. Chemical reactions always involve creating new bonds or destroying old bonds by changing the bonding of the atoms.
2. The Law of Conservation of Mass says that the same atoms must be present before and after the reaction.
3. To balance a chemical equation, you change the coefficients of the atoms in front of each substance until there are the same number of each type of atoms in both reactants and products.
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