Which statement best explains why the temperature of a pure substance remains…
PHYSICS · Single correct · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics
Problem
Which statement best explains why the temperature of a pure substance remains constant while it is melting at 1 atm?
(a) The specific heat capacity of the liquid phase is greater than that of the solid phase, so additional heat does not raise the temperature.
(b) The absorbed heat is converted into work as the substance expands during melting rather than increasing temperature.
(c) All the heat supplied is used to overcome intermolecular forces rather than to increase average kinetic energy.
(d) Energy is lost to the surroundings at the same rate it is supplied, keeping the temperature constant.