CHALLENGE 1

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

6Zn6Zn33(PO(PO44))22

Coefficient: Distributed throughout the entire compound.

Subscript: only applies to the element in front of it.

Zinc = 18

Phosphorus = 12

Oxygen = 48

1. CO2

2. 2H2O

3. Mg(OH)2

4. 3NaHCO3

5. 2H2SO4

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 = ____

1. CO2

2. 2H2O

3. Mg(OH)2

4. 3NaHCO3

5. 2H2SO4

The answers are …

C = 1 O = 2

H = 4 O = 2

Mg = 1 O = 2 H = 2

Na = 3 H = 3 C = 3 O = 9

H = 4 S = 2 O = 8

1. 4CO2

2. 2H2O2

3. 3Mg(OH)2

4. 6NaSO4

5. 4CH4

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!

1. 4CO2

2. 2H2O2

3. 3Mg(OH)2

4. 6NaSO4

5. 4CH4

The answers are …

C = 4 O = 8

H = 4 O = 4

Mg = 3 O = 6 H = 6

Na = 6 S = 6 O = 24

C = 4 H = 16

1. 6CO

2. 4H2O

3. 3 C6H8O7

4. 2CaCO3

5. 4NH3

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!

The answers are …

C = 6 O = 6

H = 8 O = 2

C = 18 H = 24 O = 21

Ca = 2 C = 2 O = 6

N = 4 H = 12

1. 6CO

2. 4H2O

3. 3 C6H8O7

4. 2CaCO3

5. 4NH3

1. 4Be(OH)2

2. 2Zn3(PO4)2

3. Sr(MnO4)2

4. 4AgClO3

5. Al(NO3)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!

1. 4Be(OH)2

2. 2Zn3(PO4)2

3. Sr(MnO4)2

4. 4AgClO3

5. Al(NO3)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

1. 5Zn(OH)2

2. 3UF4

3. 2Sn(CrO4)2

4. 3Pb(NO3)2

5. 2NH4NO3

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!

1. 5Zn(OH)2

2. 3UF4

3. 2Sn(CrO4)2

4. 3Pb(NO3)2

5. 2NH4NO3

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