A word equation uses words to represent the reactants and products in a chemical reaction. A formula equation uses chemical symbols or formulas, but does not reveal the ratios of the products and reactants. A chemical equation is a balanced formula equation.

Aluminium + iron9(III)oxide ⇒ aluminium oxide + iron(word equation)

Explanation:

1] A word equation uses words to represent the reactants and products in a chemical reaction. It can be shown by the following example -

Aluminium + iron9(III)oxide ⇒ aluminium oxide + iron (word equation)

2] A formula equation uses chemical symbols or formulas, but does not reveal the ratios of the products and reactants. It can be shown by the following example -.

  ⇒   (formula equation)

3] A chemical equation is a balanced formula equation. It can be shown by the following example -            

  ⇒   (chemical equation)

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa