State the information provided by a chemical equation. Chemical equations suffer from a number of limitations. State the main limitations of a chemical equation.

Information provided by a chemical equation :

1. The formulas & symbols of the reactants & products.
2. The physical state of the substance whether it is solid, liquid or gas.
3. The special conditions required such as heat, catalyst, direction of reaction.
4. Tells the ratio in which the substances react in a balanced equation.

Chemical equation do not tell us about:

1. The physical states of the reactants & products - hence [(s) for solids, (g) for gas may be added]
2. The conditions such as temperature, pressure or catalyst which affect the reaction.
3. The concentration of the reactants & products hence [(dil.) dilute & (conc) concentrated may be added.]
4. The nature of the chemical reaction.
5. The speed of the reaction.
6. The heat changes accompanying the reaction.
7. The completion of the reaction.