Answer:
a
Explanation:
the kinetic energy decreases which makes the molecules bond together, that makes them not be able to move much
The average kinetic energy decreases due to the motion of the particles. Hence, option (b) is correct.
Given data:
The ice cube tray full of water kept in a refrigerator.
And water reaches at 0ºC to undergo the phase change from liquid to solid.
We know that, "The energy possessed by a molecule or any object due to its motion is known as average kinetic energy of molecule/object".
Now at initial the tray containing the water molecules were in liquid state. And in liquid state, the intermolecular interaction is less than that of solid. So water molecules were having more value of average kinetic energy.
When the temperature of water in the tray is reduced to 0ºC , then the they converted into solid with strong intermolecular interaction. And with this, now water molecules are not that much free to move, hence decrease in average kinetic energy occurs in the particles in the water as it undergoes a phase change.
Thus, we can conclude that the average kinetic energy decreases due to the motion of the particles. Hence, option (b) is correct.
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