Name:…………………………………………………….
Date: ……………………
Representing Chemicals Worksheet
This worksheet accompanies Representing Chemicals Summary.
1. Link the terms on the left with their descriptions on the right by drawing a line
between the two.
compound
a substance made of only one type of atom
atom
made up of two or more atoms bonded together
molecule
a substance that contains at least two elements
that have been chemically combined
2. Tick the correct boxes according to whether these are elements or compounds
compound
silver (Ag)
copper sulfate (CuSO4)
carbon monoxide (CO)
oxygen (O2)
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element
Name:…………………………………………………….
Date: ……………………
3. Complete the table to show the name, molecular formula and display formula for
each molecule.
Name
Molecular Formula
Display Formula
CO2
hydrochloric acid
magnesium sulfate
H–H
H2SO4
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Name:…………………………………………………….
Date: ……………………
4. Complete these sentences to explain the ratio of atoms in each of these compounds.
AL2O3 – for every …..……. aluminium atom(s), there are ……..…. oxygen atom(s).
SO2 – for every …..……. sulfur atom(s), there are …..……. oxygen atom(s).
Ag2O – for every ……..…. silver atom(s), there are ………... oxygen atom(s).
KCl – for every ……..…. potassium atom(s), there are ……..…. chlorine atom(s).
5. Complete the table to show the elements that make up these compounds.
Name
Element 1
Element 2
NiI2
SnO
Mg3N2
ZnCl2
Li3N
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