Questions: The law of conservation of energy states that

Solution Steps

The law of conservation of energy is a fundamental principle in physics which states that the total energy in an isolated system remains constant over time. This means that energy can neither be created nor destroyed, but it can change forms (e.g., from kinetic to potential energy).

Let's evaluate each option in the context of the law of conservation of energy:

• Option 1: "the energy of the reactants and products in a chemical reaction are always equal" - This is not necessarily true as energy can be transferred to or from the surroundings.
• Option 2: "all chemical reactions are reversible" - This is not related to the conservation of energy.
• Option 3: "energy can be created, but not destroyed" - This contradicts the law of conservation of energy.
• Option 4: "energy cannot be created or destroyed" - This directly aligns with the law of conservation of energy.

Final Answer