3
Question Question 3
Differentiate between:
(a) Reactants and products
(b) Chemical reaction and chemical equation
(c) A balanced and a skeletal chemical equation
(a) Difference between reactants and products :
| Reactants | Products |
|---|---|
| The substances that undergo chemical change are called reactants. | The new substances formed as a result of reaction are called products. |
| Reactants are written on the left hand side of the equation. | Products are written on the right hand side of the equation. |
| In equation C + O2 ⟶ CO2, C and O2 are reactants. | In equation C + O2 ⟶ CO2, CO2 is product. |
(b) Difference between chemical reaction and chemical equation :
| Chemical reaction | Chemical equation |
|---|---|
| Any chemical change in matter which involves its transformation into one or more new substances is called a chemical reaction. | A chemical reaction can be represented with the help of symbols or the formulae of the elements and the compounds taking part in the reaction in the form of a chemical equation. |
| Example of chemical reaction is burning of candle. | Example — 2H2 + O2 ⟶ 2H2O |
(c) Difference between a balanced and a skeletal chemical equation :
| Balanced chemical equation | Skeletal chemical equation |
|---|---|
| In balanced chemical equation the total number of atoms on the reactant side as well as the product side are equal. | In skeletal chemical equation the total number of atoms on the reactant side and product side are not equal. |
| Example: Zn + H2SO4 ⟶ ZnSO4 + H2 | Example: H2 + O2 ⟶ H2O |