3.7 Particles on the move [Must do]#

Particles in liquids and gases are free to move around. If you spray an air freshener, the particles of the gas will spread through the room until you can smell their scent at any point in the room. This process is called _________.

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• osmosis

• conduction

• diffusion

• convection

Particles in liquids and gases are free to move around. If you spray an air freshener, the particles of the gas will spread through the room until you can smell their scent at any point in the room. This is because the particles . . ...

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• have no fixed positions and are always moving.

• break loose and start to slide over each other.

• fly about, bumping into things.

• are held together by forces of some kind.

Which of these statements describes diffusion?

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• When soup is cooked, it starts to bubble

• If a gas tap is turned on but not lit, gas can soon be smelled throughout the room.

• When sand is poured, the grains slide over each other.

For diffusion to occur, you need to . . .

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• wave your arms around in the air (if it is a gas) or stir the substance (if it is a liquid)

• heat the substance

• do nothing

When the diffusion process is complete, the particles . . .

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• stop moving

• move slower

• continue to move

• move faster

For diffusion to occur, the particles must be free to move around. Which states of matter can diffusion occur in?

Answers Required: 2

• solid

• liquid

• gas

Diffusion occurs when there is a difference in concentration from one area to another. Which diagram shows the highest concentration of particles?

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• A

• B

• C

• D

Diffusion is the movement of particles from an area of high __________ to an area of low __________. Which word can fill both gaps in this sentence?

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• concentration

• temperature

• energy

• speed

Diffusion occurs when there is a difference in the concentration of a liquid or gas from one area to another. If the difference in concentration is high, then the rate of diffusion is __________.

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• high

• low

Diffusion occurs when there is a difference in the concentration of a liquid or gas from one area to another. If the difference in concentration is low, then the rate of diffusion is __________.

Answers Required: 1

• high

• low