Diffusion through a permeable material: practical | Science

Starter quiz

Who is correct?
- Aisha: "Only liquids are made up of particles."
- Izzy: "Only gasses are made up of particles."
- Lucas: "Only liquids and gasses are made up of particles."
- Sam: "Solids, liquids and gasses 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. ✓
Match each scientific term to its correct definition.
- concentration gradient
  
  ⇔
  
  different concentrations of particles in one area and another ✓
- net movement
  
  ⇔
  
  the overall movement of particles from one area to another ✓
- diffusion
  
  ⇔
  
  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.
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
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

Particles of liquid can move through a material if it is ______.
- 'permeable' ✓
Particles of liquid can move into a cube of jelly by the process of ...
- concentration.
- decolourisation.
- diffusion. ✓
- prediction.
- variation.
In which beaker have particles of acid diffused all the way to the centre of the jelly cube?
- beaker A
- beaker B
- beaker C
- beaker D ✓
Jelly cubes are placed in acid at three different temperatures, and the time taken for the acid to decolourise each cube is recorded. Match the types of variables to the factors.
- independent variable
  
  ⇔
  
  temperature of the acid ✓
- dependent variable
  
  ⇔
  
  time taken to decolourise each cube ✓
- control variable
  
  ⇔
  
  the size of the cubes ✓
Which scientific prediction is most likely to be correct?
- At lower temperatures, the time taken to decolourise the cube will be longer. ✓
- At lower temperatures, the time taken to decolourise the cube will be shorter.
- Temperature will have no effect on the time taken to decolourise the cubes.
Jelly cubes of three different widths are placed in acid. Which cube will be completely decolourised by the acid in the shortest time?
- The cube of width 1.0 cm ✓
- The cube of width 1.5 cm
- The cube of width 2.0 cm
- The taken will be the same for each of the cubes.

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Particles of a liquid can move through a material by diffusion if the material is permeable.
Observe a liquid diffusing into a jelly cube.
Predict and observe effect of temperature on the diffusion of a liquid into a jelly cube.
Predict and observe effect of cube size on the diffusion of a liquid into a jelly cube.
Use ideas about particles and diffusion to explain these observations.

Particles cannot diffuse through a seemingly solid material.

This practical lesson enables pupils to observe the diffusion of acid through permeable cubes of coloured jelly.

Diffusion - Diffusion is the net movement of particles of a substance down a concentration gradient.
Net movement - Net movement is the overall movement of particles from one area to another.
Permeable - A material is permeable if particles of a liquid are able to move through it.
Variable - In a science experiment, a variable is a factor that can be changed, kept the same, or measured.
Prediction - A scientific prediction is a testable statement about a possible outcome of an experiment