Law of Conservation of Mass?
Consider a chemical reaction where 2g of sodium reacts with 4g of chlorine to form sodium chloride. If 5g of sodium chloride is produced, and assuming no air or water is present in the reaction, would you expect any change in the mass of the reactants and the product, according to the Law of Conservation of Mass?
1 Answer
📌 CONCEPT: The Law of Conservation of Mass states that matter cannot be created or destroyed in a chemical reaction, only transformed from one substance to another.
📐 RULE / FORMULA: In a chemical reaction, the total mass of the reactants is equal to the total mass of the products.
💡 WORKED EXAMPLE: In the given reaction, 2g of sodium reacts with 4g of chlorine to form 5g of sodium chloride. According to the Law of Conservation of Mass, the total mass of the reactants (2g + 4g) is equal to the total mass of the product (5g).
⚠️ COMMON MISTAKE: Students often assume that mass is always conserved in chemical reactions, but they may not consider the possibility of air or water being present in the reaction, which can affect the total mass of the reactants and products.
14 Jun 26
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