Name: _____________________________________
Per: __________
Elements vs. Compounds
Part 1:
Identify the following as an element, compound or diatomic element using the letters E, C or DE:
Li ______
Ba ______
CaCl2 ______
H2 ______
O2 ______
FeBr2 ______
Mg(NO3)2 ______
H2O ______
Fe ______
K ______
Cl2 ______
CH4 ______
Na2O ______
List all of the diatomic elements that exist: __________________________________________________
Part 2:
Determining how many atoms of each element are in a given chemical formula.
Type of
Compound
No subscripts
Example
NaCl
Only subscripts
H2SO4
Subscripts and
parentheses
Mg(NO3)2
How many
total elements?
How many atoms of each element?
Practice: Chemical Formulas
# of Elements
# of atoms of each element
1. FeO
______________
______________________________________
2. IF5
______________
______________________________________
3. Al2(SO4)3
______________
______________________________________
4. AuCl3
______________
______________________________________
5. K3AsO4
______________
______________________________________
6. Ca(C2H3O2)2 ______________
______________________________________
7. (NH4)2CO3
______________
______________________________________
8. Cs2HPO4
______________
______________________________________
9. CuSO3
______________
______________________________________
10. BeSO4
______________
______________________________________
Homework:
# of Elements
# of atoms of each element
F3NO3S
______________
______________________________________
CH3OCH3
______________
______________________________________
(CH3)2C2O4
______________
______________________________________
(C2H5)2NH
______________
______________________________________
Ca(C2H3O2)2
______________
______________________________________
Cu(NbO3)2
______________
______________________________________
Mg3(Si2O5)(OH)4
______________
______________________________________
Describe in your own words, the difference between elements and compounds.
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