Question

part a
which of the following substances can have variable composition?
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graphite
water
air
diamond

Explanation:

• Graphite is an element (carbon in a particular form), with a fixed composition.
• Water (\(H_2O\)) is a compound with a fixed ratio of hydrogen to oxygen atoms.
• Air is a mixture of gases (e.g., \(N_2\), \(O_2\), \(CO_2\), etc.). The composition of mixtures can vary. For example, air in a polluted area has more pollutants (like \(SO_2\), particulate matter) compared to clean - air areas.
• Diamond is an element (carbon in a different crystalline form than graphite), with a fixed composition.

Answer:

air