1. CHALLENGE 1 T. Trimpe 2008 http://sciencespot.net/

2. 6Zn 3 (PO 4 ) 2 Coefficient: Distributed throughout the entire compound. Subscript: only applies to the element in front of it. Zinc = 18 Phosphorus = 12 Oxygen = 48

3. 1. CO 2 2. 2H 2 O 3. Mg(OH) 2 4. 3NaHCO 3 5. 2H 2 SO 4 Use the formulas provided to determine the number of atoms of each element in each compound. List each element by symbol and tell how many atoms there are in the compound. C = ____ O = ____

4. 1. CO 2 2. 2H 2 O 3. Mg(OH) 2 4. 3NaHCO 3 5. 2H 2 SO 4 The answers are … C = 1 O = 2 H = 4 O = 2 Mg = 1 O = 2H = 2 Na = 3 H = 3C = 3 O = 9 H = 4 S = 2O = 8

5. 1. 4CO 2 2. 2H 2 O 2 3. 3Mg(OH) 2 4. 6NaSO 4 5. 4CH 4 Use the formulas provided to determine the number of atoms of each element in each compound. Remember to list each element’s symbol and tell the number of atoms for each!

6. 1. 4CO 2 2. 2H 2 O 2 3. 3Mg(OH) 2 4. 6NaSO 4 5. 4CH 4 The answers are … C = 4 O = 8 H = 4 O = 4 Mg = 3 O = 6H = 6 Na = 6 S = 6 O = 24 C = 4 H = 16

7. 1. 6CO 2. 4H 2 O 3. 3 C 6 H 8 O 7 4. 2CaCO 3 5. 4NH 3 Use the formulas provided to determine the number of atoms of each element in each compound. Remember to list each element’s symbol and tell the number of atoms for each!

8. The answers are … C = 6 O = 6 H = 8 O = 2 C = 18 H = 24O = 21 Ca = 2 C = 2 O = 6 N = 4 H = 12 1. 6CO 2. 4H 2 O 3. 3 C 6 H 8 O 7 4. 2CaCO 3 5. 4NH 3

9. 1. 4Be(OH) 2 2. 2Zn 3 (PO 4 ) 2 3. Sr(MnO 4 ) 2 4. 4AgClO 3 5. Al(NO 3 ) 3 Use the formulas provided to determine the number of atoms of each element in each compound. Remember to list each element’s symbol and tell the number of atoms for each!

10. 1. 4Be(OH) 2 2. 2Zn 3 (PO 4 ) 2 3. Sr(MnO 4 ) 2 4. 4AgClO 3 5. Al(NO 3 ) 3 The answers are … Be = 4 O = 8 H = 8 Zn = 6 P = 4 O = 16 Sr = 1 Mn = 2 O = 8 Ag = 4 Cl = 4 O = 12 Al = 1 N = 3 O = 9

11. 1. 5Zn(OH) 2 2. 3UF 4 3. 2Sn(CrO 4 ) 2 4. 3Pb(NO 3 ) 2 5. 2NH 4 NO 3 Use the formulas provided to determine the number of atoms of each element in each compound. Remember to list each element’s symbol and tell the number of atoms for each!

12. 1. 5Zn(OH) 2 2. 3UF 4 3. 2Sn(CrO 4 ) 2 4. 3Pb(NO 3 ) 2 5. 2NH 4 NO 3 The answers are … Zn = 5 O = 10 H =10 U = 3 F = 12 Sn = 2 Cr = 4 O = 16 Pb = 3 N = 6 O = 18 N = 4 H = 8 O = 6