Ilaalinta cufka iyo isla'egyada calaamadeysan ee dheeli tiran

The mass of the products in a chemical reaction is the same as the mass of the reactants. Word equations are a simple way of describing chemical reactions. Chemical formulae represent the numbers of each type of atoms in a reactant or product. Chemical equations represent how the atoms in the reactants rearrange to form the products. The arrow in a chemical equation represents the words ‘changes into’.