English National Curriculum - Science

Diffusion

Mission Objectives

Define diffusion and describe how it occurs across cell membranes

Explain the effect of surface area, temperature, and concentration gradient on diffusion rate

Describe adaptations of exchange surfaces in mammals, fish, and plants that maximise the rate of diffusion

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Keywords

Words and meanings to learn

diffusion

The process by which particles spread from an area of high concentration to an area of low concentration.

particles

Small, minute pieces that make up solids, liquids, and gases.

concentration

The amount of a substance in a given volume, affecting how quickly diffusion occurs.

surface area to volume ratio

A measurement that affects how quickly substances can diffuse into cells.

net-movement

The overall direction that particles move, even though they are all moving randomly

This lesson has been written by

Samantha Batch

Samantha is a dedicated and accomplished science educator with over 15 years of leadership experience in the field, coupled with a strong background in scientific analysis. She has a proven track record of strategically managing educational departments, driving operational efficiencies, and nurturing collaborative relationships with stakeholders. 

Samantha previously served as the Head of Chemistry and Sixth Form Tutor, Ilkley Grammar School, Ilkley with extensive Key Stage 4 and 5 teaching experience and leadership. In addition to her teaching and leadership roles, she is also an examiner for AQA, providing her with valuable insight into assessment standards and exam specifications.

In her spare time, Samantha enjoys playing the accordion with her local orchestra and has recently taken up cricket, where she's enthusiastically honing her skills both on and off the pitch!

Required Resources

PowerPoint slides and visual aids (particle diagrams, SA:Vol ratio tables)

Agar jelly cubes with sodium hydroxide and phenolphthalein indicator

Beakers of hydrochloric acid

Rulers, stopwatches, scalpels, tweezers

Practical worksheet with pre-filled and blank SA/Vol tables

Adaptation card sort or fact sheet on exchange surfaces (lungs, gills, leaves, intestines)

Differentiated challenge questions for stretch and application

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