Question

При нагревании тела: 1) кинетическая энергия молекул увеличивается 2) потенциальная энергия молекул уменьшается 3) изменения внутренней энергии не происходит 4) кинетическая энергия молекул уменьшается

Answer 1

увеличивается кинетическая энергия молекул.

Answer 2

Heating of a Body

When a body is heated, several changes occur in its energy state. Let's address each statement in detail:

1) Kinetic energy of molecules increases: - When a body is heated, the temperature of the body increases, which in turn increases the kinetic energy of its molecules. - This increase in kinetic energy causes the molecules to move more rapidly, leading to an overall increase in the body's internal energy.

2) Potential energy of molecules decreases: - As the body is heated, the potential energy of its molecules decreases. - This decrease in potential energy is a result of the molecules moving further apart from each other due to the increase in temperature, leading to a reduction in the potential energy of the intermolecular forces.

3) No change in internal energy: - Contrary to the statement, there is a change in the internal energy of the body when it is heated. - The increase in kinetic and decrease in potential energy collectively contribute to a change in the internal energy of the body.

4) Kinetic energy of molecules does not decrease: - This statement is incorrect. When a body is heated, the kinetic energy of its molecules increases, as mentioned earlier.

In summary, when a body is heated, the kinetic energy of its molecules increases, the potential energy of its molecules decreases, and there is a change in the internal energy of the body. The statement that the kinetic energy of molecules decreases when a body is heated is not accurate.