The following holds true for the latent heat of fusion of a material except for a. The heat of fusion is a property of the material. b. The heat of fusion describes the amount of heat per unit mass needed to change the phase of the material. c. The heat of fusion of directly proportional to the temperature. d. The heat of fusion is constant.

Which of the following best describes a substance in which the tempeture remains constant while at the same time it is experiencing an inward heat flow? A. Substance undergoing a change of state B. every substance undergoes a change in tempeture when heat is given to it C. solid D. gas E. liquid

The same heat transfer into identical masses of different substances produces different temperature changes. Calculate the final temperatures when 1 kcal of heat transfers into 1.5 kg of the following, originally at 21°C. Hint a. Into water: the final temperature of water is °C. b. Into concrete: the final temperature of concrete is °C. c. Into steel: the final temperature of steel is C. d. Into mercury: the final temperature of mercury is °C.

A student decides they need a cup of coffee. The energy lost as the coffee cools down is _____ the energy gained by the surrounding air. A.equal to B.greater than C.hard to tell D.less than