Diffusion through a permeable material: practical | Starter Quiz | Oak National Academy

Who is correct?

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Answer explanation

Solids, liquids and gasses are all made up of particles. All substances, in all states, are made up of particles.

The particles that make up a liquid are ...

• fixed in position.

• constantly moving from side to side.

• constantly moving in random directions.

Answer explanation

The particles that make up a liquid are constantly moving in random directions.

Match each scientific term to its correct definition.

• net movement

• the net movement of particles down a concentration gradient

• concentration gradient

• the overall movement of particles from one area to another

• diffusion

• different concentrations of particles in one area and another

Answer explanation

A concentration gradient is a difference in the concentration of particles from one area to another. Net movement is the overall movement of particles from one area to another. Diffusion is the net movement of particles down a concentration gradient.

Which statement is true?

• There is a higher concentration in area A than area B.

• There is a higher concentration in area B than area A.

• The concentration is the same in area A and area B.

Answer explanation

Concentration is the number of particles in a volume of liquid or gas. So there is a higher concentration of particles in area A than in area B.

In which direction will there be net movement of particles?

• net movement from area A to area B

• net movement from area B to area A

• net movement in both directions

• no net movement

Answer explanation

Net movement of particles will be down a concentration gradient. So there will be net movement from area A to area B.

In which direction will particles move along the concentration gradient?

• only from area A to area B

• only from area B to area A

• in both directions

• in neither direction

Answer explanation

Particles move in randomly in all directions. So even though net movement will be down a concentration gradient, some particles will move up the concentration gradient from area B to area A.