Species that occur on the left hand side of the reaction equation are reactants while species that occur on the right hand side of a reaction equation are called products.
A chemical reaction involves the combination of two or more substances to form a new substance(s). Sometimes, a chemical reaction may involves the breaking up a substance into other substances.
Given the reaction;
2H+ + CO32- → H2O + CO2
2H+ and CO32- are reactants while H2O and CO2 are products. The number 2 is a coefficient.
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