THERMODYNAMICS HEAT AND
TEMPERATURE EXAM QUESTIONS
WITH CORRECT SOLUTIONS
ex of reflectors - ANSWER-metals, white colors
absorber - ANSWER-convert radiant energy into thermal energy
absorber ex - ANSWER-solar cells, dark colors
emitters - ANSWER-objects that give off radiation; transfer energy into surroundings
object that are good absorbers are good____ - ANSWER-emitters
ex of emitter - ANSWER-black top roads
system - ANSWER-interaction between objects isolated for study; does not include the
environment
heat always flows from - ANSWER-hot to cold
energy transfer from one object to another because of - ANSWER-temp differences
change in thermal energy is rep by letter - ANSWER-q
the calorie - ANSWER-measure of heat energy req to raise temp of 1 gram of water by
1C
different substances experience _____ temperature changes when the same amount of
heat energy is added to them - ANSWER-different
specific heat - ANSWER-substances ability to absorb heat energy; measure of heat
energy required to raise temp of 1 gram of substance by 1 C
symbol for specific heat - ANSWER-c
water has ____ specific heat - ANSWER-very high
the higher the specific heat the _____ is takes to heat up and requires ______ energy -
ANSWER- longer ;more
metals have ___ specific heat - ANSWER-low
, energy can be transferred between objects as - ANSWER-work or heat
internal energy VS. heat - ANSWER-IE- kinetic energy go particles WITHIN objects
H- energy transferred to or from object
adding heat can produce work but always produces _____ too - ANSWER-internal
energy
adding work will increase _____, but always gives off ____ too - ANSWER-internal
energy, heat
entropy - ANSWER-a measure of disorder in a system
increased particle of kinetic energy=____ entropy - ANSWER-increased
laws of entropy - ANSWER-1.objects will not spontaneously freeze in warm
environment
2.entropy within a system can increase or decrease
3. entropy of the universe is always increasing
second law of thermodynamics - ANSWER-an isolated system will spontaneously move
to the state of thermal equilibrium ; energy moves in both directions more moves from
hot to cold
in thermal equilibrium entropy is ____ throughout the system - ANSWER-same; energy
moves each direction with equal probability
machines can't transform all energy to ____ - ANSWER-work; cannot be 100 percent
efficient
more entropy and disorder = _____ available energy - ANSWER-less
When is the only time heat will flow? - ANSWER-When two objects are at different
temperature
You have a cup of cold water at 20 c and cup of hot water at 75 c. When you pour them
together the temperature will change. When will the temp of system stop changing? Will
temp change be consistent throughout system? - ANSWER-When they have reached
tbermal equilibirum and yeah
Which of these temp is most reasonable temp of water after it was mixed(from above
question) ? 15, 45, 75, or 85 C - ANSWER-45, because final temp will be in between
initial temps
TEMPERATURE EXAM QUESTIONS
WITH CORRECT SOLUTIONS
ex of reflectors - ANSWER-metals, white colors
absorber - ANSWER-convert radiant energy into thermal energy
absorber ex - ANSWER-solar cells, dark colors
emitters - ANSWER-objects that give off radiation; transfer energy into surroundings
object that are good absorbers are good____ - ANSWER-emitters
ex of emitter - ANSWER-black top roads
system - ANSWER-interaction between objects isolated for study; does not include the
environment
heat always flows from - ANSWER-hot to cold
energy transfer from one object to another because of - ANSWER-temp differences
change in thermal energy is rep by letter - ANSWER-q
the calorie - ANSWER-measure of heat energy req to raise temp of 1 gram of water by
1C
different substances experience _____ temperature changes when the same amount of
heat energy is added to them - ANSWER-different
specific heat - ANSWER-substances ability to absorb heat energy; measure of heat
energy required to raise temp of 1 gram of substance by 1 C
symbol for specific heat - ANSWER-c
water has ____ specific heat - ANSWER-very high
the higher the specific heat the _____ is takes to heat up and requires ______ energy -
ANSWER- longer ;more
metals have ___ specific heat - ANSWER-low
, energy can be transferred between objects as - ANSWER-work or heat
internal energy VS. heat - ANSWER-IE- kinetic energy go particles WITHIN objects
H- energy transferred to or from object
adding heat can produce work but always produces _____ too - ANSWER-internal
energy
adding work will increase _____, but always gives off ____ too - ANSWER-internal
energy, heat
entropy - ANSWER-a measure of disorder in a system
increased particle of kinetic energy=____ entropy - ANSWER-increased
laws of entropy - ANSWER-1.objects will not spontaneously freeze in warm
environment
2.entropy within a system can increase or decrease
3. entropy of the universe is always increasing
second law of thermodynamics - ANSWER-an isolated system will spontaneously move
to the state of thermal equilibrium ; energy moves in both directions more moves from
hot to cold
in thermal equilibrium entropy is ____ throughout the system - ANSWER-same; energy
moves each direction with equal probability
machines can't transform all energy to ____ - ANSWER-work; cannot be 100 percent
efficient
more entropy and disorder = _____ available energy - ANSWER-less
When is the only time heat will flow? - ANSWER-When two objects are at different
temperature
You have a cup of cold water at 20 c and cup of hot water at 75 c. When you pour them
together the temperature will change. When will the temp of system stop changing? Will
temp change be consistent throughout system? - ANSWER-When they have reached
tbermal equilibirum and yeah
Which of these temp is most reasonable temp of water after it was mixed(from above
question) ? 15, 45, 75, or 85 C - ANSWER-45, because final temp will be in between
initial temps
