Answers25-26 CHEMISTRY IN THE EARTH SYSTEM S1Temperature and Heat

Heat Transfer Answers

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1
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Which two conditions must exist in order for radiation to occur?

A
the presence of a solid, liquid, or gas and a temperature difference
B
direct contact of molecules and the presence of a solid, liquid, or gas
C
the presence of electromagnetic waves and direct contact of molecules
D
a temperature difference and the presence of electromagnetic waves
2
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Selma made a diagram to compare convection and radiation.

Question illustration
A
Must involve temperature differences between substances or objects
B
Only occurs when molecules are in direct contact
C
Involves the movement of fluids based on density differences
D
Can occur where there is little or no matter
3

Which condition must exist in order for conduction to occur between two substances?

A
The molecules of the substances must be touching.
B
Both substances must be the same temperature.
C
At least one substance must be a liquid.
D
Most of the molecules must be slow moving.
4

Which is an example of convection?

A
In a mountain forest, the sun heats up the ground.
B
On a hot day, Amaya pours water on her face to cool off.
C
At the beach, Stephan’s feet get hot walking across the sand.
D
Above the sea, warm air rises, cools, and sinks.
5

Dante pours hot tea into a mug that is cool to the touch. Which best explains what will happen now?

A
The tea will get warmer because the mug acts as a thermal insulator.
B
The tea will get cooler because it gains energy from the mug.
C
The mug will get warmer because thermal energy transfers from the tea to the mug.
D
The mug will get warmer because the tea creates more thermal energy inside the mug.
6

Radiation occurs when energy is transferred by electromagnetic waves.

Answer not available
7

Which best describes a wave?

A
a collision of particles
B
a disturbance that carries energy
C
a movement of fluids
D
a group of electrically charged molecules
8

Convection can occur in which two substances?

A
wood and air
B
ice and wood
C
water and ice
D
air and water
9

Substance X is placed in a container with substance Y. Both substances are fluids. Substance X initially sinks to the bottom of the container. After five minutes of being heated on a hot plate, substance X becomes less dense than substance Y.

A
Substance X will rise due to convection.
B
Substance Y will rise due to convection.
C
Substance X will rise due to radiation.
D
Substance Y will rise due to radiation.
10

fluidswaveselectricitycharges

A
fluids
B
waves
C
electricity
D
charges

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