Chemistry Thermodynamics Multiple
Choice Exam || Complete Questions &
Answers (100% Correct) - 2025
In which thermodynamic system is work done on or by the system but no energy is
transferred to or from it as heat? - ANSWER - adiabatic
What is the internal energy change of a system that adds 100 J of heat while doing 200
J of work - ANSWER - -100 J
Which device below uses heat to do mechanical work - ANSWER - heat engine
What is the efficiency of a heat engine that takes in 100,000 J of energy during
combustion and expels 60,000 J of exhaust in one cycle? - ANSWER - 40%
Greater entropy (or disorder) in a thermodynamic system means that there is _____
energy available to do work. - ANSWER - less
Although the entropy for parts of a system can decrease, the total entropy of the
universe is always increasing? - ANSWER – true
the ability to do work - ANSWER - energy
all chemical reactions require what - ANSWER - energy
energy is absorbed when - ANSWER - breaking a bond
energy is released when - ANSWER - forming a bond
energy cannot be created or destroyed it can only change forms - ANSWER - law of
conservation of energy
The energy associated with motion - ANSWER - kinetic energy
energy associated with the position of an object relative to the force upon it - ANSWER -
potential energy
The study of the flow of energy - ANSWER - thermodynamics
refers to what is being studied - ANSWER - system
everything else that may not affect the system - ANSWER - surroundings
, the sum of all the possible forms of energy of all the ions, atoms, and molecules in a
system; state function (determined only by the state of the system) - ANSWER - initial
energy (E)
Temperature is proportional to the ______ of the particles in a substance - ANSWER -
Average kinetic energy
A 5 kg cast iron frying pan at 40 degrees Celsius has more internal energy than a 3 kg
cast iron pan at 40 degrees Celsius - ANSWER - True
The energy that flows between objects at different temperature is called - ANSWER -
Heat
Heat always flows from a lower temperature body to a higher temperature body -
ANSWER - False
The state in which two or more bodies in contact with one another have identical
temperatures is called - ANSWER - Thermal Equilibrium
50 o F is equivalent to - ANSWER - 10 degrees Celsius
Absolute zero is - ANSWER - the lowest possible temperature
The amount of energy required to raise the temperature of a 2 kg silver chain by 2oC is
- ANSWER - d. 936 J
(2 kg)(2 degrees)(234 [specific heat])
The amount of energy required to completely vaporize 5 kg of water at 100oC is -
ANSWER - 1.13 x 107 J
Which type of energy transfer explains the temperature increase throughout an iron rod
when one end is placed in a fire? - ANSWER - thermal conduction
Which type of energy transfer is illustrated by the rising of hot air over a flame? -
ANSWER - convection
How much work is done by a gas that exerts a pressure of 4 x 105 Pa while increasing
its volume by 0.025 m3? - ANSWER - 10,000 J
the transfer of energy between objects or systems that are in contact and are at
different temperature - ANSWER - heat (Q)
the transfer of energy by a volume change when there is a pressure difference between
the system on the surroundings - ANSWER - work (W)
Choice Exam || Complete Questions &
Answers (100% Correct) - 2025
In which thermodynamic system is work done on or by the system but no energy is
transferred to or from it as heat? - ANSWER - adiabatic
What is the internal energy change of a system that adds 100 J of heat while doing 200
J of work - ANSWER - -100 J
Which device below uses heat to do mechanical work - ANSWER - heat engine
What is the efficiency of a heat engine that takes in 100,000 J of energy during
combustion and expels 60,000 J of exhaust in one cycle? - ANSWER - 40%
Greater entropy (or disorder) in a thermodynamic system means that there is _____
energy available to do work. - ANSWER - less
Although the entropy for parts of a system can decrease, the total entropy of the
universe is always increasing? - ANSWER – true
the ability to do work - ANSWER - energy
all chemical reactions require what - ANSWER - energy
energy is absorbed when - ANSWER - breaking a bond
energy is released when - ANSWER - forming a bond
energy cannot be created or destroyed it can only change forms - ANSWER - law of
conservation of energy
The energy associated with motion - ANSWER - kinetic energy
energy associated with the position of an object relative to the force upon it - ANSWER -
potential energy
The study of the flow of energy - ANSWER - thermodynamics
refers to what is being studied - ANSWER - system
everything else that may not affect the system - ANSWER - surroundings
, the sum of all the possible forms of energy of all the ions, atoms, and molecules in a
system; state function (determined only by the state of the system) - ANSWER - initial
energy (E)
Temperature is proportional to the ______ of the particles in a substance - ANSWER -
Average kinetic energy
A 5 kg cast iron frying pan at 40 degrees Celsius has more internal energy than a 3 kg
cast iron pan at 40 degrees Celsius - ANSWER - True
The energy that flows between objects at different temperature is called - ANSWER -
Heat
Heat always flows from a lower temperature body to a higher temperature body -
ANSWER - False
The state in which two or more bodies in contact with one another have identical
temperatures is called - ANSWER - Thermal Equilibrium
50 o F is equivalent to - ANSWER - 10 degrees Celsius
Absolute zero is - ANSWER - the lowest possible temperature
The amount of energy required to raise the temperature of a 2 kg silver chain by 2oC is
- ANSWER - d. 936 J
(2 kg)(2 degrees)(234 [specific heat])
The amount of energy required to completely vaporize 5 kg of water at 100oC is -
ANSWER - 1.13 x 107 J
Which type of energy transfer explains the temperature increase throughout an iron rod
when one end is placed in a fire? - ANSWER - thermal conduction
Which type of energy transfer is illustrated by the rising of hot air over a flame? -
ANSWER - convection
How much work is done by a gas that exerts a pressure of 4 x 105 Pa while increasing
its volume by 0.025 m3? - ANSWER - 10,000 J
the transfer of energy between objects or systems that are in contact and are at
different temperature - ANSWER - heat (Q)
the transfer of energy by a volume change when there is a pressure difference between
the system on the surroundings - ANSWER - work (W)
