Which changes occur to a sample of liquid water when its temperature is increased? Select two.

Question

A.
The water boils across a wide range of temperatures.
B.
The molecules of water increase in size and mass.
C.
The molecules of water move faster and gain kinetic energy.
D.
At the boiling point, the molecules of water separate from one other and form a gas.
E.
At the boiling point, the molecules of water break apart into atoms.

Answer 1

The two correct changes that occur to a sample of liquid water when its temperature is increased are:

C. The molecules of water move faster and gain kinetic energy.

D. At the boiling point, the molecules of water separate from one another and form a gas.

These options accurately describe the effects of increasing temperature on water. As the temperature rises, the kinetic energy of the water molecules increases, causing them to move faster. Upon reaching the boiling point, the water molecules break free from the liquid state and transition into the gas phase (steam).