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Heat & Thermodynamics HW Pt 1 - Ch 21 - Heat



Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 

Temperature is related mostly to the _____.
a.
average molecular kinetic energy in a substance
b.
total kinetic energy in something
c.
average energy in a substance
d.
total energy in something
e.
average kinetic energy of an object
 

 2. 

Which temperature scale labels the freezing point of water at 0 degrees?
a.
Celsius
b.
Caloric
c.
Kelvin
d.
Fahrenheit
e.
none of the above
 

 3. 

Heat is the _____.
a.
average amount of energy per molecule contained in an object
b.
total amount of energy contained in an object
c.
energy transferred between objects because of a temperature difference
d.
amount of energy all the molecules have
e.
all of the above
 

 4. 

Internal energy is the _____.
a.
average amount of energy contained in an object
b.
amount of energy that is transferred from one object to another object
c.
total amount of energy contained in an object
d.
amount of kinetic energy all the molecules have
e.
all of the above
 

 5. 

Heat is measured in _____.
a.
kilocalories
b.
joules
c.
calories
d.
all of the above
e.
none of the above
 

 6. 

The energy content of a piece of food is normally determined by _____.
a.
eating the piece of food
b.
measuring the volume of the food
c.
burning the food
d.
none of the above
 

 7. 

Some molecules are able to absorb large amounts of energy in the form of internal vibrations and rotations. Materials composed of such molecules would have _____.
a.
high specific heat capacities
b.
low specific heat capacities
 

 8. 

Specific heat capacity is related to the amount of internal energy _____.
a.
transferred by one molecule
b.
one molecule contains
c.
a specific object has
d.
transferred by one object
e.
needed to change the temperature of one kilogram of a substance one degree
 

 9. 

Which has the higher specific heat capacity, water or sand?
a.
Water
b.
Sand
c.
They both have the same specific heat capacity.
 

 10. 

The reason an ocean's temperature doesn't vary much from one season to the next is that _____.
a.
oceans are located in mild regions of the Earth
b.
oceans are located next to large land areas
c.
water has a high specific heat capacity
d.
water has a low specific heat capacity
e.
there are a lot of fish in the oceans
 

 11. 

The largest extremes in temperature are usually experienced _____.
a.
on islands
b.
near the oceans
c.
in the middle of a continent
d.
in Japan
e.
near large coastal cities like San Francisco
 

 12. 

The fact that desert sand is very hot in the day and very cold at night is evidence that sand has a _____.
a.
low specific heat capacity
b.
high specific heat capacity
 

 13. 

If the specific heat capacity of water were higher than it is, lakes would be _____.
a.
more likely to freeze
b.
less likely to freeze
c.
neither of the above
 

 14. 

During a very cold winter, water pipes sometimes burst. The reason for this is _____.
a.
water expands when freezing
b.
water contracts when freezing
c.
the ground contracts when colder, pulling pipes apart
d.
the thawing process releases pressure on the pipes
e.
none of the above
 

 15. 

8000 Joules  of heat are added to 1 kilogram of water when its temperature is 40°C. The resulting temperature of the water is
a.
46°C
b.
39°C
c.
42°C
d.
50°C
 

 16. 

A change in temperature of 10°C is equal to a change of
a.
–273 K
b.
10 K
c.
263 K
d.
273 K
e.
283 K
 

 17. 

Mix a liter of 60°C water with 2 liters of 40°C water and you'll have 3 liters of water at _____.
a.
50°C
b.
53°C
c.
25°C
d.
47°C
 

 18. 

Which is denser, ice at 0 degrees C or water at 4 degrees C?
a.
The water
b.
The ice
c.
They both have the same density.
 

 19. 

The lowest possible temperature is
a.
–273 degrees C.
b.
4 K.
c.
0 degrees C.
 

A=True/B=False
Indicate whether the sentence or statement is true or false.
 

 20. 

The average kinetic energy of molecules in a substance is related to temperature.
 

 21. 

A temperature scale that has 100 degrees between the boiling point and the freezing point of water is the Fahrenheit scale.
 

 22. 

Heat is the energy that moves from one object to another because of a temperature difference.
 

 23. 

The total of all energies in a substance is its temperature.
 

 24. 

A Joule is a common unit of force.
 

 25. 

The amount of heat required to change the temperature of a unit mass of a substance by 1 degree is its specific heat capacity.
 

 26. 

Liquids usually expand when heated.
 

 27. 

Gases don't expand very much when heated.
 

Essay:
 

 28. 

Explain why putting a dented table-tennis ball in a pot of boiling water will help remove the dent.
 

 29. 

Give two reasons why a tire pump becomes hotter when used to pump a tire.
 

 30. 

What amount of heat is required to raise the temperature of 150 grams of water by 20°C?
 

 31. 

Suppose you apply a flame and heat one liter of water (which has a mass of 1Kg) and raise its temperature by 40°C. If you instead transfer the same quantity of heat to 8 liters of water at the same temperature, what will be the temperature increase?
 

 32. 

An absolute temperature of 473 K is the same as what Celsius temperature?
 

 33. 

Give both the Kelvin and Celsius temperatures for absolute zero, freezing point and boiling point.
 

Problem
 

 34. 

The temperature of an object is raised by 70ºC. This is equivalent to what increase in its absolute temperature?
 



 
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