Skeletal equation are the equation which represents the reactants and the products involved but which is not balanced in terms of stoichiometric coefficient. In simple words, skeletal chemical equation is an unbalanced chemical equation.

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Word equations can be very useful. Generally, however, skeleton equations, in which we have substituted chemical formulas for the chemical names, are even more useful. Skeleton equations are also sometimes called unbalanced equations.

Continuing with the electrolysis of water, we have a skeleton equation, "H2O rtarrow.gif (850 bytes) H2 + O2." The formula for water is H2O; the formula for hydrogen is H2; and the formula for oxygen is O2. A skeleton equation is just a way of using the formulas to indicate the chemicals that were involved in the chemical reaction.

"Mg + O2 rtarrow.gif (850 bytes) MgO." This skeleton equation shows that magnesium reacts with oxygen to form magnesium oxide. It also shows that the formula for magnesium is Mg, for oxygen is O2, and for magnesium oxide is MgO. Throughout this lesson you will be presented the formulas of chemicals in equations.

In the examples presented so far you know that the formulas have been established by experimental data such as mass and volume measurements, calculations including composition, and reasoning using Avogadro’s Law. Similar work has gone into determining the other formulas you will see. In a few lessons you will know enough about the nature of atoms of different elements to be able to predict the formulas of the compounds they will form. For the time being just work with the formulas as presented.

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