Question

When heat is constantly supplied by a gas burner with small flame to melt ice, then the temperature of ice during melting:

• A. increases very slowly
• B. does not increase at all
• C. first remain constants then decreases
• D. None of these

Answer 1

Answer: (B)

does not increase at all

To turn solid ice into liquid water we have to push the water molecules inside further apart and break apart the framework (or crystalline structure) that holds them together. So while ice is melting (during the change of state from solid water to liquid ice) all the heat energy we supply is being used to separate molecules and none is left over for raising the temperature.The heat needed to change a solid into a liquid is called the latent heat of fusion.