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Giving an example list two information which make a chemical equation more useful (informative).

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Chemical equations can be made more informative by the following characteristics: 

Physical state 

There are three different states which are solid, liquid and gaseous. If the substance exists in solid state, it is represented by (s). 

If the substance exists in aqueous state, it is represented by (aq). 

If the substance exists in gaseous state, it is represented by (g). 

For example: 

CaCO3(s) \(\overset{heat}\longrightarrow\) CaO(s) + CO2(g)

Evolution of gas 

If the gas is liberated in a reaction, it is indicated by an arrow upward and its physical state is shown by (g). 

For example: 

Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g)↑

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