Convection

Question 1

How is thermal energy transferred during convection?

Revolt · Accepted Answer

by movement in fluids

Question 2

Use the drop-down menus to complete the sentences describing what happens when the temperature of a fluid increases. The kinetic energy of the molecules . The speed of the molecules . The density of the fluid . The fluid .

Revolt · Accepted Answer

Selection 1: increases; Selection 2: increases; Selection 3: decreases; Selection 4: rises

Question 3

Which statements best describe convection? Check all that apply.

Revolt · Accepted Answer

Convection occurs in liquids and gases.; Convection transfers thermal energy.; Convection occurs until all of the fluid is at the same temperature.

Question 4

Which describes the motion in a convection current?

Revolt · Accepted Answer

circular motion

Question 5

The diagram shows molecules in a fluid. Explain the sequence of events that happens when this fluid cools down. Be sure to focus on what happens to the molecules and to the fluid in general. Five events should be included in your answer.

Revolt · Accepted Answer

As the fluid cools down, the following sequence of events occurs: 1. The thermal energy of the fluid decreases. 2. The molecules lose kinetic energy and begin to move more slowly. 3. As the molecules slow down, the attractive forces between them pull them closer together. 4. Because the molecules are closer together, the fluid's volume decreases and its density increases (thermal contraction). 5. Eventually, the movement slows enough that the fluid may undergo a phase change, such as freezing into a solid.

Question 6

What did you include in your response? Check all that apply.

Revolt · Accepted Answer

The kinetic energy of the molecules decreases.; The molecules slow down.; The molecules move closer together.; The density of the fluid increases.; The fluid sinks.

Question 7

In a lava lamp, a waxy substance rises and falls repeatedly. What causes the waxy substance to rise? Check all that apply.

Revolt · Accepted Answer

The waxy substance is warm.; The waxy substance is less dense than the surrounding liquid.; Convection is occurring.

Question 8

What happens at night?

Revolt · Accepted Answer

Cool air over the land moves offshore.

Question 9

Use the drop-down menus to identify each labeled part of the diagram. Label A: Label B: Label C:

Revolt · Accepted Answer

Cool fluid sinks; Selection 1: Cool fluid sinks; Selection 2: Warm fluid rises; Selection 3: Convection current

Question 10

Question 13

Revolt · Accepted Answer

Warm fluid rises

Convection Answers

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