Name_______________________________ Date __________ Period _______
Counting Atoms Practice
Determine how many atoms of each element are present:
1)
CaF2 ______________________________________________________
2)
Be(OH)2 ____________________________________________________
3)
NO2 ______________________________________________________
4)
Al2(SO4)3 ___________________________________________________
5)
3NH4NO3 ___________________________________________________
6)
S2F2 ______________________________________________________
7)
Na2CO3 ____________________________________________________
8)
5CH4 ______________________________________________________
9)
4CoO______________________________________________________
10)
MgSO4_____________________________________________________
Count the atoms for each of the compounds on both sides of the equation.
1.
H2 + O2 
2. KClO3 
H2O
KCl + O2
3. Na + Cl2 
NaCl
Think About It….
How do the equations above disobey the Law of Conservation of Matter?
How can it be fixed?