Question

jin bought a heat pack that weighs 15 g. he shook it so it would release heat to warm his hands. the release of heat indicates a chemical reaction took place in a closed system. what would be the mass of the heat pack after the chemical reaction? 10 g 12 g 5 g 15 g

Explanation:

Step1: Recall the Law of Conservation of Mass

In a closed system, the total mass remains constant during a chemical reaction. This means that the mass of the reactants equals the mass of the products.

Step2: Apply the Law to the Heat Pack

The heat pack is a closed system. Initially, its mass is 15 g. Since no matter is added or removed in a closed system during the chemical reaction, the mass after the reaction should be the same as the initial mass.

Answer:

15 g (corresponding to the option with "15 g")