Question

lesson 24: systems and energy
during a chemical or physical change, the total energy of the universe
remains the same
decreases due to heat loss
increases due to heat gained
cannot be determined

Explanation:

According to the law of conservation of energy (first law of thermodynamics), energy cannot be created or destroyed. It can only be transferred or transformed from one form to another. In a chemical or physical change, any energy lost by the system is gained by the surroundings and vice - versa. So, the total energy of the universe (system + surroundings) remains constant.

Answer:

remains the same