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Heat — Quiz Answers

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Heat that flows by conduction is the transfer of thermal energy between substances in contact. What must occur for this to happen?

A
The two systems must be the same temperature.
B
The thermal energy of one system must be the same as the thermal energy of the other system.
C
The two systems must not be touching each another.
D
One system must have higher kinetic energy than the other system.
2
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A student touches a freshly baked cake that was taken out of the oven. Which best explains why the cake feels hot?

A
Molecules in the skin are moving faster than molecules in the cake.
B
The kinetic energy of molecules in the baking tray is more than the energy in the cake.
C
The kinetic energy of molecules in the cake is more than the energy in the baking tray.
D
Molecules in the cake are moving faster than molecules in the skin.
3

The temperature of a gas is increased. Which statement best explains the effect that this has on the motion of gas particles?

A
The average kinetic energy increases, and the particles collide more frequently.
B
The average kinetic energy increases, and the particles stop colliding.
C
The average kinetic energy decreases, and the particles collide less frequently.
D
The average kinetic energy decreases, and the particles stop colliding.
4

A hot metal plate at 150 times degree C has been placed in air at room temperature. Which event would most likely take place over the next few minutes?

A
The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
B
Molecules in both the metal and the surrounding air will start moving at higher speeds.
C
The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up.
D
Molecules in both the metal and the surrounding air will start moving at lower speeds.
5

What is thermal energy?

A
the total number of molecules in a system
B
the average overall volume of a system
C
the kinetic energy of particles in a system
D
the measure of temperature in a system
6

Which statement about exothermic reactions is accurate?

A
As reactants form products, the potential energy increases.
B
Thermal energy is transferred from the product to the reacting substances.
C
Thermal energy is transferred from the surroundings to the reacting substances.
D
As reactants form products, the potential energy decreases.
7

The temperature of a gas is increased. Which statement best explains the effect that this has on the motion of gas particles?

A
The average kinetic energy increases, and the particles collide more frequently.
B
The average kinetic energy decreases, and the particles stop colliding.
C
The average kinetic energy decreases, and the particles collide less frequently.
D
The average kinetic energy increases, and the particles stop colliding.
8

A hot metal plate at 150 times degree C has been placed in air at room temperature. Which event would most likely take place over the next few minutes?

A
The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
B
Molecules in both the metal and the surrounding air will start moving at lower speeds.
C
The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up.
D
Molecules in both the metal and the surrounding air will start moving at higher speeds.
9

Which event is endothermic?

A
the change of water vapor to a liquid
B
the combustion of propane gas
C
the burning of a match
D
the melting of ice
10

Heat that flows by conduction is the transfer of thermal energy between substances in contact. What must occur for this to happen?

A
The two systems must be the same temperature.
B
The two systems must not be touching each another.
C
One system must have higher kinetic energy than the other system.
D
The thermal energy of one system must be the same as the thermal energy of the other system.

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