Questions: Question 3 of 50 When molecules absorb heat, there is an increase in A the kinetic energy of the molecules. B The potential energy of the molecules. C The mass of the molecules. D The bond energy of the molecules.

Solution Steps

When molecules absorb heat, the energy is typically transferred to the molecules, causing changes in their energy states. This energy can manifest in different forms, such as kinetic energy, potential energy, or bond energy.

• Option A: The kinetic energy of the molecules increases when they absorb heat. This is because heat energy causes the molecules to move faster, increasing their kinetic energy.
• Option B: The potential energy of the molecules can increase if the heat causes a change in the molecular structure, such as a phase change. However, this is not the most direct effect of heat absorption.
• Option C: The mass of the molecules does not change with heat absorption. Mass is a conserved quantity and is not affected by energy changes.
• Option D: The bond energy of the molecules refers to the energy required to break chemical bonds. While heat can affect bond energy, it is not the primary effect of heat absorption.

The most direct and immediate effect of heat absorption by molecules is an increase in their kinetic energy. This is because the absorbed heat energy is converted into motion, causing the molecules to move more vigorously.

Final Answer