According to the Law of Conservation of Mass, what is conserved during a chemical reaction?

• A. The total mass of the reactants and products
• B. The temperature of the reactants
• C. The volume of the system
• D. The number of molecules

Answer: (A)

Verified step by step guidance

1. Understand the Law of Conservation of Mass: It states that mass cannot be created or destroyed in a chemical reaction.
2. Identify what is conserved: Since mass is neither created nor destroyed, the total mass of the reactants must equal the total mass of the products.
3. Analyze other options: Temperature, volume, and number of molecules can change during a reaction, so they are not conserved.
4. Conclude that the correct conserved quantity during a chemical reaction is the total mass of the reactants and products.
5. Summarize: The Law of Conservation of Mass ensures that the sum of the masses before and after the reaction remains constant.