What happens to the temperature of a mixture of ice and liquid water as heat is

Question

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.

Explanation / Answer

ANSWER

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.

REASON: At melting point of ice, the heat is consumed as 'latent heat' ie heat used for breaking intermoleccular strong bonds of solid ice and making them weaker, so that they become water.
Heat does not get used up for increaseing internal energy of system. Hence temperature remains constant till all ice melts.

After all melts, temperature increases as not external heat is converted to internal energy of system.

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