Any four limitations of chemical reaction

1.It does not tells us whether a reaction proceeded completely or not.Like in some reactions some of the reactants remains unreacted and the chemical equation of this reaction doesn't tells us about it.

2.Chemical equations does not tells us/indicate the speed of reaction.I doesn't tell us how fast or how slow the reaction was.

3.It does not tells us about the physical changes like colour,state.So we have to mention it seperately.

4.It does not tell us about through which method the reaction proceeded.

5.Also in chemical reactions many intermediates are formed for a small amount of time.These are not expressed in a chemical equation...

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10 years is the answer