1. Identify the different elements that make up the following compound.
Bell Work:
Identify the different elements that make up the following compound.
Mg(NO3)2

2. The Atom Shuffle You will be given a card.
You will walk around (randomly) until the teacher calls out a chemical formula.
You must form the compound with other classmates. (Look at each other’s cards.)
The last group to “bond” loses.

3. Counting aToms with Coefficients
Coefficients apply to the entire compound. Multiply the coefficient and each subscript.
Easy way = add up the atoms (like you were taught) and then multiple that number by the coefficient
Coefficient

4. Counting aToms with Coefficients
5H2O
Hydrogen = 2
Oxygen = 1
(2 + 1 = 3)
………now multiply by 5
15 Total Atoms

5. 2K3PO4 16 Total Atoms Now you try… K = 3 P = 1 O = 4
(All that equals 8….8 x 2 = )
16 Total Atoms

6. 8 Total Atoms 2H2O2 Now you try… H = 2 O = 2
(All that equals 4….4 x 2 = )
8 Total Atoms

7. 9 Total Atoms 3CuCl2 Now you try… Copper = 1 Chlorine = 2
(All that equals 3…..3 x 3 = )
9 Total Atoms