What is the change in internal energy of the molecules of a body during phase change?

The internal energy is the sum of the kinetic energy of the molecules and the chemical potential energy of the molecules. During a change of phase, the average kinetic energy of the molecules stays the same (with the temperature), but the average potential energy changes.

What is the change in internal energy of a gas during?

Change in internal energy: If the temperature of an ideal gas changes, the change in internal energy of the gas is proportional to the change in temperature. If there is no change in temperature, there is no change in internal energy (as long as the number of moles of gas remains constant).

Does internal energy change in state change?

Yes the internal energy of a system can change during a phase transition, although the temperature is fixed. In almost all everyday phase transitions, like melting, vaporization etc. the internal energy of the system does change.

Does internal energy change during state change?

When matter changes state, its internal energy changes, so the kinetic energy of its constituent particles changes. As it is changing from one state to another, the change in energy is reflected in the bonds between the particles, and therefore the temperature of the object doesn’t change.

Why does the internal energy not change during an isothermal process?

Internal energy is due to motion of particles in a system. As internal energy depends on temperature. As we know temperature in isothermal process is constant so the internal energy will also be constant thus the change in internal energy will be zero.

What is the change in internal energy of a gas during adiabatic expansion?

In the adiabatic expansion of the gas, the work done by the gas is always positive. Since the work done by the gas is positive the internal energy decreases, so the temperature of the gas also decreases.