Question

The metal caesium has a low melting point. It means that it'll melt if you keep it in your palm. What happens to its molecules with regard to the energy when the temperature increases?

• A. The energy of the molecules of the substance increases.
• B. The energy of the molecules of the substance decreases.
• C. The energy may increase or decrease depending on the temperature.
• D. The energy of the molecules remains the same.

Answer 1

The correct option is A

The energy of the molecules of the substance increases.

When the temperature of a substance is increased by heating, the kinetic energy of the molecules of the substance increases. The transfer of heat takes place when these molecules start vibrating with high energy and hence energy transfers from one molecule to another.