The cards Question What is diffusion? Tap to flip Answer The net movement of a substance from an area of higher concentration to an area of lower concentration. Question Is diffusion an active or a passive process? Tap to flip Answer Passive. Question What is a passive process? Tap to flip Answer A process that does not need any additional energy. Question What is concentration? Tap to flip Answer The number of particles in a volume of liquid or gas. Question What is a concentration gradient? Tap to flip Answer A difference in the concentration of particles from one area to another. Question What is net movement? Tap to flip Answer The overall movement of particles from one area to another. Question In which direction is the net movement of particles in diffusion? Tap to flip Answer Down a concentration gradient. Question What are all substances, including a cell's cytoplasm, made up of? Tap to flip Answer Particles. Question How do the particles that substances are made of move? Tap to flip Answer In random directions, colliding all the time. Question Do particles stop moving once they have spread out evenly (equilibrium)? Tap to flip Answer No. They keep moving randomly all the time. Question When is a material permeable? Tap to flip Answer When particles of a liquid can move through it. Question When can particles of a liquid move into a material by diffusion? Tap to flip Answer When the material is permeable. Question Can particles diffuse into a material that looks solid, such as a jelly cube? Tap to flip Answer Yes, if the material is permeable: acid can diffuse into a jelly cube. Question In a science experiment, what is a variable? Tap to flip Answer A factor that can be changed, kept the same or measured. Question What is a scientific prediction? Tap to flip Answer A testable statement about a possible outcome of an experiment. Question What does the cell membrane control? Tap to flip Answer What can enter and leave the cell. Question How do particles of some substances diffuse into and out of a cell? Tap to flip Answer By moving through small holes in the cell membrane. Question Why can some substances not diffuse through the cell membrane? Tap to flip Answer Their particles are too big to pass through the holes in the membrane. Question When is a material selectively-permeable? Tap to flip Answer When some substances can move through it but others cannot. Question Why is the cell membrane described as selectively-permeable? Tap to flip Answer Only some substances can diffuse through it. Question Can all substances diffuse through the cell membrane? Tap to flip Answer No. Only substances whose particles are small enough to pass through its holes. Question In which direction is the net movement of particles through a cell membrane? Tap to flip Answer Down a concentration gradient. Question Why can we not see the particles that substances are made of? Tap to flip Answer They are too small. Where this deck sits in the curriculum Curriculum National Curriculum for England Stage Key stage 3 (Years 7–9) Course KS3 Science Unit Diffusion England's National Curriculum sets what is taught; the units and their order are Oak National Academy's. Flash Feed is not affiliated with Oak or any exam board.
How this deck was checked On 2026-11-02, every card was compared with its source: the lessons of Oak National Academy, a public body funded by England's Department for Education that publishes lessons for the national curriculum. Because the cards come from those lessons, no second source was sought. The comparison was done automatically, not by a teacher, so a card can still be wrong. Flash Feed is not affiliated with any source named here.
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A Science lesson by Oak National Academy licensed under Open Government Licence (OGL)
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