Chemical Symbols and Formula Worksheet

1. Why are symbols useful in describing chemicals?
2. What two things does a chemical formula tell us about a compound?
3. Write the chemical formula for the following:
a. A molecule of carbon dioxide is made up of 1 atom of carbon and 2 atoms of oxygen.
_____________________________
b. A molecule of aspirin that is made up of 9 atoms or carbon, 8 atoms of hydrogen, and 4 atoms of oxygen
_____________________________
c. A molecule of sugar that is made up of 6 atoms of carbon, 12 atoms of hydrogen and 6 atoms of oxygen
_____________________________
4. Fill in the following table:
Name
Formula
Number of Elements
Ex) Acetic acid
C2H4O2
3
Paradichlorobenzene
C6H4O2
Pyrite
FeS3
Sucrose
C11H22O11
Butane
C4H10
Asbestos
H4Mg2Si2O9
Sulfuric Acid
H2SO4
Atoms in the Formula
C=2
H=4
O=2
Use the information in the text box to answer the following questions.
Atom- small particles that make up all matter
Element- made up of only one type of atom
Compound- two or more elements in a fixed composition
Molecule- a group of two or more atoms bonded together
5. True or False:
a. A substance can be both an element and a compound.
_____
b. An element is always a molecule.
_____
c. An element is sometimes a molecule.
_____
d. A compound is always a molecule.
_____
e. Molecules are either elements or compounds.
_____
6. Check off the boxes that apply to the given chemical formulas:
Chemical Formula
C6
Na2S
K
H2O
Na2F2
Cl2
O3
NaCl
He
C6H12O6
Element
Compound
Molecule

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