Coefficients
List the number of atoms of each element in the following molecules
Example: 2CO2 2 atom of carbon, 4 atoms of oxygen
3CH4
4NH3
2NaCl
2C2H6
3NO3
Subscripts
List the number of atoms of each element in the following molecules
Example: H2O 2 atoms of hydrogen, 1
atom of oxygen
H2O2
NaCl
CO2
NO3
C6H12O6
Subscripts and Coefficients Answer Key
2 atoms of hydrogen, 2 atoms of oxygen
1atom of sodium, 1 atom of chlorine
1atom of carbon, 2 atoms of oxygen
1atom of nitrogen, 3 atoms of oxygen
6 atoms of carbon, 12 atoms of hydrogen, 6 atoms of oxygen
3 atoms of carbon, 12 atoms of hydrogen
4 atoms of nitrogen, 12 atoms of hydrogen
2 atoms of sodium, 2 atoms of chlorine
4 atoms of carbon, 12 atoms of hydrogen
3 atoms of nitrogen, 9 atoms of oxygen
Name ______________________
Subscripts and Coefficients
1. CaCO3 Ca _____ C _____ O _____ Total _____
2. 2C2H5OH C _____ H _____ O _____ Total
_____
3. 3H2SO4 H _____ S _____ O _____ Total _____
4. AgNO3 Ag _____ N _____ O _____ Total
_____
5. 5H3PO4 P _____ O _____ H _____ Total _____
6. 2H2O2 H _____ O_____ Total
_____
7. 4BaSO4 Ba _____ S _____ O _____ Total _____
8. 6NaOH Na _____ O _____ H _____ Total
_____
9. 4Fe2O3 Fe _____ O _____ Total _____
Directions. For each of the compounds below, write the number of atoms for
each element as well as the the total number of atoms in the compound.
Directions. For each of the compounds below, write the number of atoms for
each element as well as the the total number of atoms in the compound.
1. (NH4)2S N _____ H _____ S _____ Total _____
2. 5Al3(SO4)2 Al _____ S _____ O _____ Total _____
3. 3Mg(NO3)2 Mg _____ N _____ O _____ Total _____
4. 2Al(OH)3 Al _____ O _____ H_____ Total _____
5. 2Fe(SCN)3 Fe _____ S _____ C _____ N _____ Total _____
Subscripts
List the number of atoms of each element in the following molecules
Example: H2O 2 atoms of hydrogen, 1 atom of oxygen
H2O2
NaCl
CO2
NO3
C6H12O6
Coefficients
List the number of atoms of each element in the following molecules
Example: 2CO2 2 atom of carbon, 4 atoms of oxygen
3CH4
4NH3
2NaCl
2C2H6
3NO3
Subscripts and Coefficients
Name ______________________
Subscripts and Coefficients
Worksheet Packet
PREVIEW
OO
O
O
H
H
S
Write the chemical formula for this molecule.
Molecules and Compounds
Name ______________________
O
OO
S
H
H
S
1.
2.
3.
4.
5.
O
O
C
Ca
O
Sulfuric Acid
Sulfuric trioxide
Hydrogen sulfide
Ammonia
H
N
HH
Calcium carbonate
Total atoms of Hydrogen ______
Total atoms of Carbon ______
Total atoms ______
Chemical Formula _______
2CH4
The Number of Atoms in the Molecules
Water
Total atoms of Hydrogen ______
Total atoms of Oxygen ______
Total atoms ______
Chemical Formula _______
Methane
Total atoms of Hydrogen ______
Total atoms of Oxygen ______
Total atoms ______
Chemical Formula _______
*The largest atom is oxygen
*The largest atom in the center is carbon, the smaller atoms are hydrogen
Total atoms of Hydrogen ______
Total atoms of Carbon ______
Total atoms ______
Chemical Formula _______
Sulfuric Acid *The large light atom is suffur, the 4 dark large atoms are oxygen, the two small
light atoms are hydrogen
Total atoms of Hydrogen ______
Total atoms of Sulfur ____
Total of Oxygen ____
Chemical Formula _______
Answer Key
CH4
2H2O
H2O
2
2
6
1
3
5
4
6
4
1
8
2
10
12
3
3H2SO4
The Number of Atoms in the Molecules
Water
Name ______________________
Total atoms of Hydrogen ______
Total atoms of Oxygen ______
Total atoms ______
Chemical Formula _______
Methane
Total atoms of Hydrogen ______
Total atoms of Oxygen ______
Total atoms ______
Chemical Formula _______
*The largest atom is oxygen
*The largest atom in the center is carbon, the smaller atoms are hydrogen
Total atoms of Hydrogen ______
Total atoms of Carbon ______
Total atoms ______
Chemical Formula _______
Total atoms of Hydrogen ______
Total atoms of Carbon ______
Total atoms ______
Chemical Formula _______
Sulfuric Acid *The large light atom is suffur, the 4 dark large atoms are oxygen, the two small
light atoms are hydrogen
Total atoms of Hydrogen ______
Total atoms of Sulfur ______
Total of Oxygen ______
Chemical Formula _______
Name ______________________
Subscripts and Coefficients
1. What could be the correct chemical formula for the compound?
A. 3NH3 B. CH4
C. 3KH4 D. 3NaOH
2. What could be the correct chemical formula for the compound?
A. CaCO3 B. 2CO2
C. C2H4F2 D. N2HO3
3. What is the correct chemical formula for the compound below?
A. 2Al(OH)3 B. AlO3H3
C. Al2O6H6 D. 2Al(OH)2
4. Which statement is correct about the compound below?
A. there are a total of 8 molecules B. there are 2 molecules
C. there are a total of 2 atoms D. there are 2 mol-
5. Write the chemical formula for the compound below.
1. CaCO3 Ca _____ C _____ O _____ Total _____
2. 2C2H5OH C _____ H _____ O _____ Total
_____
3. 3H2SO4 H _____ S _____ O _____ Total _____
4. AgNO3 Ag _____ N _____ O _____ Total
_____
5. 5H3PO4 H _____ P _____ O _____ Total _____
6. 2H2O2 H _____ O_____ Total
_____
7. 4BaSO4 Ba _____ S _____ O _____ Total _____
8. 6NaOH Na _____ O _____ H _____ Total
_____
ANSWER KEY
Subscripts and Coefficients
Directions. For each of the compounds below, write the number of atoms for
each element as well as the the total number of atoms in the compound.
Directions. For each of the compounds below, write the number of atoms for
each element as well as the the total number of atoms in the compound.
1. (NH4)2S N _____ H _____ S _____ Total _____
2. 5Al3(SO4)2 Al _____ S _____ O _____ Total _____
3. 3Mg(NO3)2 Mg _____ N _____ O _____ Total _____
4. 2Al(OH)3 Al _____ O _____ H_____ Total _____
5. 2Fe(SCN)3 Fe _____ S _____ C _____ N _____ Total _____
1 1 3
4 12 2
6 3 12
1 1 3
15 5 20
4 4
4 4 16
6 6 6
8 12
3 3 12
2 8 1
15 10 40
3 6 18
2 6 6
266
5
18
21
5
40
8
24
18
20
18
11
65
27
14
206
Five Worksheets with
Answer Keys
