Question

Which of the following correctly describes what happens to the kinetic energy of water when it changes from steam to a liquid? The kinetic energy of the molecules increases. The kinetic energy of the molecules decreases. The kinetic energy of the molecules increases then decreases. There is no change in the kinetic energy of the molecules

Answer 1

The kinetic energy of water molecules decreases when water changes from steam to a liquid, due to a loss of heat and decreased motion of molecules as per the Kinetic Molecular Theory.

Step-by-step explanation:

When water changes from steam to a liquid, the kinetic energy of the molecules decreases. This is because, during the transition from steam (gas) to liquid, the molecules lose energy in the form of heat. This loss in energy results in reduced motion of the water molecules, which is directly associated with the kinetic energy of the molecules.

The Kinetic Molecular Theory (KMT) explains that kinetic energy is a function of the temperature of the substance. As steam cools down, the temperature drops, resulting in a decrease in the kinetic energy of water molecules. Upon condensation, the water molecules come closer together as the intermolecular forces increase, which also signifies a decrease in the random motion of the molecules and thus, their kinetic energy.

Answer 2

When liquid water turns to steam the molecules move (faster or slower) and heat is (added or removed) from the water. ... The molecules in the steam have (more or less) Kinetic Energy. When liquid water turns to steam the molecules move (faster or slower) and heat is (added or removed) from the water.