Lesson Plan: B1.2.05

Hamble Lesson Observation Plan
Learning About
What is diffusion?
Keywords:
  • Waste Product: A chemical substance released by cells as a by-product of metabolic reactions. (1)
  • Concentration: The amount of a substance in a given volume. (1)
  • Concentration Gradient: The difference between a high and low concentration. (1)
  • Diffusion: Passive movement of particles from a high to a low concentration. (1)
Memory Anchor:
Method Precise Learning Objective Linked Question / Activity
(Designed for maximum working out)		 Stepping Stones Pitstop Check
(Thinking Map)
Substances may move into and out of cells across the cell membranes via diffusion. How do substances move in and out of cells?
Diffusion is the spreading out of the particles of any substance in solution, or particles of a gas, resulting in a net movement from an area of higher concentration to an area of lower concentration. What is the definition for diffusion?

Activity 1: Dropping food colouring into beakers of water to see the diffusion. (could vary temperature of water to see how it affects the rate) Activity 2: Spraying perfume in corner of the room. Hands up when they can smell it.
Some of the substances transported in and out of cells by diffusion are oxygen and carbon dioxide in gas exchange. Name two substances that are transported in and out of cells by diffusion during gas exchange

Some of the substances transported in and out of cells by diffusion are the waste product urea from cells into the blood plasma for excretion in the kidney. How does the waste product urea reach the kidney to be excreted?
Explain how the difference in concentrations (concentration gradient) affect the rate of diffusion. How does the concentration gradient affec the rate of diffusion?

Explain how the difference in the temperature affect the rate of diffusion. How does the difference in temperature affect the rate of diffusion?
Explain how the surface area of the membrane affect the rate of diffusion. How does the surface area of the membrane affect the rate of diffusion?

Task 1: What factors could affect the rate of diffusion? Task 2: Draw sketch graphs for the different factors that can affect the rate of diffusion SUPER CHALLENGE: Explain, using examples from nature how factors can affect the rate of diffusion. CHALLENGE: Explain how each factor affects the rate of diffusion in terms of particles. STRETCH: Describe the factors that can affect the rate of diffusion in terms of particles.
Links To the Big Ideas
ForcesParticlesEnergyCells