Friday 11 March 2011

1. Recants
2. Products
3. Chemical reaction
4. Rearrangement
5. Breaking, forming
6. Same atoms
7. Missing, new atoms
8. Rearrange the bonds
9. 2, 2. 1, 1.
10. 2, 1
11. Law of conservative mass
12. Atoms, Mass
13. 2, 2, 2
14. Cu atoms 1, O atoms 2, Cu atoms 2, O atoms 2
15.To balance this equation, we have to add Cu molecules to the products, because this reaction doesn’t make lone Cu atoms.
16.When we added a molecule of CuO, now the number of OXYGEN atoms is balanced but the number of Cu atoms don’t match. Now we have to add more Cu atoms to the reactants.
17. 2 Cu + 2 O2 ----> 2 CuO
18. 1 Ch4 + 2 O2 ----> 2 H2O + 1 CO2
19. 1 N2 + 3 H2 ------> 2 NH3
20. 2 KClO3 = 2 KCl + 3 O2
21. 4 Al + 3 O2 = 2 Al2O3

Summary:
Chemical reactions always involve: breaking bonds, making bonds, or both.

The Law of Conservation of Mass says that the same atoms must be: There must be the same amount of present before and after the reaction.

coefficients; atoms

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