English National Curriculum - Science
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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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
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.
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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
Expert film
Mission assignment film
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