12. Law of Multiple Proportions CO and CO 2 H 2 O and H 2 O 2 NH 3 and N 2 H 4
13. Law of Multiple Proportions NH 3 and N 2 H 4 N 2 + 3 H 2 ---> NH 3 N 2 + 2 H 2 ----> N 2 H 4
14. Law of Multiple Proportions NH 3 and N 2 H 4 N 2 + 3 H 2 ---> NH 3 28 g 6 g 34 g N 2 + 2 H 2 ----> N 2 H 4 28 g 4 g 32 g
15. Law of Multiple Proportions When elements combine to form more than one compound, different masses of one element compared to the mass of the other element are small whole number ratios.
16. Law of Multiple Proportions CO and CO 2 2 C + O 2 ---> 2 CO 24 g 32 g 56 g C + O 2 ----> CO 2 12 g 32 g 44 g
33. Atomic Symbols Mass Number A = Sum of protons and neutrons Atomic number, Z = # of protons
34. Atomic Symbols Mass Number A = Sum of protons and neutrons Atomic number, Z = # of protons The number of neutrons for any atom will be the difference between A and Z (A – Z = # neutrons)