Diffusion Flashcards

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1
Q

What is the definition of diffusion?

A

The spreading out of particles from an area of HIGH CONCENTRATION to an area of LOW CONCENTRATION

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2
Q

Where does diffusion happen?

A

In solutions and gases

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3
Q

Why does diffusion not happen in solids?

A

Because the particles in a solid are not free to move about randomly

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4
Q

What is the simplest type of diffusion?

A

When different gases diffuse through each other

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5
Q

What is an example of diffusion?

A

When perfume diffuses through the air in a room

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6
Q

How do dissolved substances move in and out of cells?

A

Diffusion

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7
Q

When does diffusion occur more rapidly?

A

When there is a larger difference in concentration, when the particles have more energy (higher temperature) and when the surface area is bigger

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8
Q

What is the difference in concentration between two areas called?

A

The concentration gradient

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9
Q

In cells, what do things diffuse through?

A

The cell membrane

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10
Q

Give an example of 4 things which can diffuse through a cell membrane

A

oxygen, water, amino acids and glucose

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11
Q

What cannot fit through a cell membrane?

A

Big molecules like starch and proteins

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12
Q

How do particles move about in a cell

A

Randomly

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13
Q

Do particles move both ways or only one way through a cell membrane?

A

Both ways

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14
Q

What will happen when there are more particles on one side of a cell membrane?

A

There is a net (overall) movement from the side with more particles

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15
Q

What are some examples of types of diffusion that happens in cells?

A

diffusion of oxygen into body cells from the bloodstream, diffusion of CO2 into actively photosynthesising plant cells, diffusion of simple sugars and amino acids from the gut through cell membranes

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