The average kinetic energy of water molecules is greatest in steam. This is because the molecules in steam are moving at a much higher speed than the molecules in water or ice. The molecules in steam are also further apart from each other than the molecules in water or ice.
Other related questions:
Q: Which sample has the greatest average kinetic energy?
A: The sample with the greatest average kinetic energy is the one with the highest velocity.
Q: Which molecules has the greatest kinetic energy?
A: There is no definitive answer to this question. In general, molecules with higher kinetic energy are more likely to be reactive, and thus more likely to participate in chemical reactions. However, there are many factors that can affect the kinetic energy of a molecule, including its size, shape, and chemical structure.
Q: Which phase of water has the greatest amount of kinetic energy?
A: The liquid phase of water has the greatest amount of kinetic energy.
Q: How do you know when the kinetic energy of a substance is the greatest?
A: The kinetic energy of a substance is the greatest when it is in its most active state.