The reactants must be balanced correctly with reactants.
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A chemical equation is properly balanced when the mass of reactants is equal to the mass of products.
Evaporation is not a chemical change and so there is no chemical equation.
To balance the chemical equation KCl, you need to make sure there are equal numbers of each type of atom on both sides of the equation. You achieve balance by adjusting the coefficients in front of the compounds in the equation. In the case of KCl, you would put a coefficient of 1 in front of KCl on both sides of the equation to balance it.
from a balanced chemical equation
A chemical equation written in symbols is sometimes called a balance equation, because the numbers of each kind of atom have to balance on both sides. If it's written in words it's called a word equation.
A chemical equation represents a complete chemical reaction. It includes chemical formulas and symbols for reactants and products, as well as coefficients to balance the equation.