The average kinetic energy of water molecules in the glass ---------- in condensation
A) icresess
B)decresess
Increase
During a change of phase the temperature does not change, but the internal energy does. 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, but the average potential energy changes. How close the molecules is a measure of potential energy. Condensation means the gas molecules are losing PE, so are becoming closer. KE remains the same. So neither of the choices can be correct, if termperature is constant.
Increase
Increases
To determine whether the average kinetic energy of water molecules in a glass increases or decreases during condensation, we need to understand the process of condensation.
Condensation refers to the phase transition of a substance from its gaseous state to its liquid state. When water vapor (gas) comes into contact with a cold surface, such as the sides of a glass, it loses energy and transforms into liquid water. This release of energy causes the water molecules to slow down, leading to a decrease in their average kinetic energy.
Therefore, the correct answer is B) Decreases.