16.2 HEAT AND THERMODYNAMICS
EXAM QUESTIONS WITH VERIFIED
ANSWERS
Work must be done on the system. - ANSWER-According to the second law of
thermodynamics, what must happen for thermal energy to flow from a colder object to a
hotter object?
waste heat - ANSWER-Thermal energy that is not converted into work is called
____________.
false - ANSWER-Is the following sentence true or false? Scientists have created a heat
engine with 100 percent efficiency by reducing the temperature of the outside
environment to absolute zero.
false - ANSWER-Is the following sentence true or false? Matter can be cooled to
absolute zero
conduction - ANSWER-The transfer of thermal energy with no overall transfer of matter
is called ___________________.
In conduction, thermal energy is transferred by collisions between particles, and there
are fewer collisions among particles in a gas than in a liquid or a solid. - ANSWER-Why
is conduction slower in gases than in liquids and solids?
true - ANSWER-Is the following sentence true or false? Conduction is faster inmetals
than in other solids because metals have free electrons that transfer thermal energy
a and d - ANSWER-Circle the letter of each sentence that is true about conduction.
a. Thermal energy is transferred without transfer of matter.
b. Matter is transferred great distances during conduction.
c. Conduction can occur between materials that are not touching.
d. In most solids, conduction takes place as particles vibrate in place.
convection - ANSWER-The transfer of thermal energy when particles of a fluid move
from one place to another is called ______________.
When air at the bottom of the oven heats up, it expands, becomes less dense, and
cools as it rises. Cooler, denser air sinks and is heated again at the bottom of the oven.
- ANSWER-Why is temperature higher at the bottom of an oven?
convection current - ANSWER-When a fluid circulates in a loop as it alternately heats
up and cools down, a(n) _________________ occurs.
EXAM QUESTIONS WITH VERIFIED
ANSWERS
Work must be done on the system. - ANSWER-According to the second law of
thermodynamics, what must happen for thermal energy to flow from a colder object to a
hotter object?
waste heat - ANSWER-Thermal energy that is not converted into work is called
____________.
false - ANSWER-Is the following sentence true or false? Scientists have created a heat
engine with 100 percent efficiency by reducing the temperature of the outside
environment to absolute zero.
false - ANSWER-Is the following sentence true or false? Matter can be cooled to
absolute zero
conduction - ANSWER-The transfer of thermal energy with no overall transfer of matter
is called ___________________.
In conduction, thermal energy is transferred by collisions between particles, and there
are fewer collisions among particles in a gas than in a liquid or a solid. - ANSWER-Why
is conduction slower in gases than in liquids and solids?
true - ANSWER-Is the following sentence true or false? Conduction is faster inmetals
than in other solids because metals have free electrons that transfer thermal energy
a and d - ANSWER-Circle the letter of each sentence that is true about conduction.
a. Thermal energy is transferred without transfer of matter.
b. Matter is transferred great distances during conduction.
c. Conduction can occur between materials that are not touching.
d. In most solids, conduction takes place as particles vibrate in place.
convection - ANSWER-The transfer of thermal energy when particles of a fluid move
from one place to another is called ______________.
When air at the bottom of the oven heats up, it expands, becomes less dense, and
cools as it rises. Cooler, denser air sinks and is heated again at the bottom of the oven.
- ANSWER-Why is temperature higher at the bottom of an oven?
convection current - ANSWER-When a fluid circulates in a loop as it alternately heats
up and cools down, a(n) _________________ occurs.
