How does the mass of reactants change in a chemical reaction?
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Solution
Law of conservation of mass.
The law of conservation of mass states that mass is neither created nor destroyed in a physical or chemical reaction.
In a chemical reaction, the total mass of the reactant is equal to the total mass of the products. There is no change in mass during a chemical reaction.
Total mass of reactants = Total mass of products.
In physical reaction, substance may undergo a change in shape, size or other physical properties but the total mass of the substance will remain the same.
Total mass of matter before a physical change + Total mass of matter after a physical change.
Example: When a wood burns in air, a chemical change occurs and the wood gets converted to ash and smoke.
The reactants are wood and oxygen from the air. The products are ash and smoke containing gases like carbon dioxide.
ie.,The total mass of reactants will equal to the total mass of products.
