Which of the following is NOT an energy store?

Sound is not considered an energy store, as it represents a form of energy transfer rather than a capacity to hold energy. Energy stores refer to ways in which energy can be stored and made available for use. The other options are indeed energy stores:

• Chemical energy is stored in the bonds of chemical compounds and can be released during chemical reactions.
• Kinetic energy is the energy of motion, which can be associated with the movement of objects but is not a store itself; rather it is often a result of the release of energy from other stores.
• Nuclear energy is stored in the nucleus of atoms and can be released during nuclear reactions.

In contrast, sound energy is a form of energy produced when objects vibrate, and it travels through mediums as waves. Once sound is produced, it dissipates quickly and does not remain stored in a system, making it fundamentally different from the other types of energy listed.