Internal energy consists of

• thermal energy and kinetic energy

• thermal energy and potential energy

• kinetic energy and potential energy

• thermal energy, kinetic energy and potential energy

When a substance is heated from 25 ^oC to 50 ^oC,

• its kinetic energy decreases.

• its potential energy decreases.

• its kinetic energy increases.

• its potential energy increases.

When a substance is cooled from 40 ^oC to 10 ^oC,

• its kinetic energy decreases.

• its potential energy decreases.

• its kinetic energy increases.

• its potential energy increases.

When a substance is cooled from liquid to solid,

• its kinetic energy decreases.

• its potential energy decreases.

• its kinetic energy increases.

• its potential energy increases.

When a substance is heated from liquid to gas,

• its kinetic energy decreases.

• its potential energy decreases.

• its kinetic energy increases.

• its potential energy increases.

When a substance is freezing,

• its kinetic energy decreases.

• its potential energy decreases.

• its kinetic energy increases.

• its potential energy increases.

When a substance is boiling,

• its kinetic energy decreases.

• its potential energy decreases.

• its kinetic energy increases.

• its potential energy increases.

When a substance is melting,

• its kinetic energy decreases.

• its potential energy decreases.

• its kinetic energy increases.

• its potential energy increases.

When a substance is condensing,

• its kinetic energy decreases.

• its potential energy decreases.

• its kinetic energy increases.

• its potential energy increases.

When a substance is cooled from gas to liquid,

• both its potential energy and internal energy decrease.

• both its potential energy and internal energy increase.

• its potential energy increases but internal energy decreases.

• its potential energy decreases but internal energy increases