Chapter 14 Flashcards
Which of the following is the smallest unit of heat energy?
Joule
The amount of heat necessary to raise the temperature of one gram of water by 1°C is referred to as a ________
calorie
The measure of the average kinetic energy of individual molecules is referred to as ________
temperature
A cup of water is scooped up from a swimming pool of water. Compare the temperature T and the internal energy U of the water in both the cup and the swimming pool.
The internal energy of an ideal gas depends on ________
its temperature
An ideal gas with internal energy U at 200°C is heated to 400°C. Its internal energy then will be ________
1.4 U
The reason ocean temperatures do not vary drastically is that ________
water has a relatively high sepcific heat
It is a well-known fact that water has a higher specific heat capacity than iron. Consider equal masses of water and iron that are initially in thermal equilibrium. The same amount of heat, 30 calories, is added to each. Which statement is true?
They are no longer in thermal equilibirum, the iron is warmer
The heat required to change a substance from the solid to the liquid state is referred to as the ________
Heat of Fusion
When a solid melts ________
heat energy enters it
When a liquid evaporates ________
heat energy enters it
When a vapor condenses ________
heat energy leaves it
Equal masses of water at 20°C and 80°C are mixed. What is the final temperature of the mixture?
50° C
On a cold day, a piece of metal feels much colder to the touch than a piece of wood. This is due to the difference in which one of the following physical property?
thermal conductivity
By what primary heat transfer mechanism is a pot of water heated on a stove?
convection
