What happens to the temperature of a mixture of ice and liquid water as heat is applied at a constant rate?

A- The temperature of the mixture increases as the ice melts, and then continues to increase at the same rate once all the ice is melted.
B- It is impossible to predict how the temperature will change unless you know the amount of ice and water that is present before the heating begins
C- The temperature of the mixture slowly increases as the ice melts. Once all the ice has melted, the temperature of the liquid water continues to rise, but at a faster rate.
D- The temperature of the mixture does not change at all until all the ice has melted, at which point it increases at a constant rate.

Recall that during a phase change the temperature remains constant until all the material has changed its phase. The energy put into the system is utilized to make the phase change, and afterward the temperature of the vliquid will start to increase.

In this case we have a mixture of liquid water and ice at 0ºC ( assume standard pressure) which is the temperature in which liquid water and ice coexist. The ice will melt until consumed at constant T = 0ºC, and then the temperature of the liquid water will start to increase at a uniform rate since we are heating at a constant rate.

Now we are in position to answer this question.

A- False the temperature does not increase as the ice melts.

B- False for the reasons given above.

C- False the temperature does not increase slowly as the ice melts, but remains constant.

D-True the temperature of the mixture does not change until all the ice has melted, and then the temperature of liquid water will start to increase uniformly.