Diffusion: moving particles
I can explain that diffusion is the movement of particles of a substance from an area of higher to lower concentration.
- Year 7
Diffusion: moving particles
I can explain that diffusion is the movement of particles of a substance from an area of higher to lower concentration.
Lesson details
Key learning points
- All substances, including the cell cytoplasm and substances within it, are made up of particles.
- These particles move in random directions and collide all the time.
- Concentration is the number of particles in a volume of liquid or gas.
- The net movement of particles is down a concentration gradient.
- Diffusion is the passive movement of particles of a substance from an area of higher to lower concentration.
Keywords
Passive process - A passive process doesn’t require any additional energy.
Concentration - Concentration is the number of particles in a volume of liquid or gas.
Concentration gradient - A concentration gradient is a difference in the concentration of particles from one area to another.
Net movement - Net movement is the overall movement of particles from one area to another.
Diffusion - Diffusion is the net movement of a substance from an area of higher concentration to an area of lower concentration.
Common misconception
Particles want or intend to spread out; particles stop moving after equilibrium has been reached.
Animations show particles in continuous random motion.
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Which of the following are not made of cells?
Q2.Which one statement about the human body is true?
Q3.Starting with the largest, put these in size order.
Q4.Match the particles with their correct arrangement.
Q5.What does the word particle refer to?
Q6.What is the particle model?
Assessment exit quiz
6 Questions
Q1.What can particles in a liquid and gas do that enables them to diffuse?
Q2.Which of the following describe the movement of particles in liquids and gases?
Q3.Which best describes diffusion?
Q4.Why is diffusion a passive process?
Q5.Which of the following are examples of particles that may be found in the cell cytoplasm?
Q6.Match the words to their definitions.
