* They represent chemical reactions. Chemical equations describe the rearrangement of atoms and molecules during a chemical change.

* They follow the law of conservation of mass. The total mass of the reactants (starting materials) must equal the total mass of the products (substances formed). This means the number of each type of atom on the reactant side must equal the number of the same type of atom on the product side.

* They use chemical formulas. Chemical formulas represent the specific molecules or compounds involved in the reaction.

* They use coefficients to balance the equation. Coefficients are the numbers placed in front of chemical formulas to ensure the same number of each type of atom on both sides.

* They may include states of matter. The state of matter of reactants and products can be indicated using symbols like (s) for solid, (l) for liquid, (g) for gas, and (aq) for aqueous (dissolved in water).

* They can be used to predict the products of a reaction. While some chemical equations represent known reactions, others can be used to predict what might happen when certain chemicals are mixed.

* They don't necessarily tell you the reaction rate or the mechanism. The equation just shows what goes in and what comes out, not how fast it happens or the exact steps involved.

Let me know if you'd like more details on any of these points!