Year 8

Diffusion

Define diffusion and explore factors that affect the rate of diffusion in the human body.

Year 8

Diffusion

Define diffusion and explore factors that affect the rate of diffusion in the human body.

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Lesson details

Key learning points

  1. Define diffusion
  2. Describe factors that affect diffusion
  3. Explain examples of diffusion in the human body

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6 Questions

Q1.
Match the state of matter to the correct arrangement of particles.
Correct Answer:solid,regular arrangement, all particles touching and in rows

regular arrangement, all particles touching and in rows

Correct Answer:liquid,irregular arrangement, all particles touching

irregular arrangement, all particles touching

Correct Answer:gas,irregular arrangement, no particles touching

irregular arrangement, no particles touching

Q2.
Which gas is taken in through the lungs and used for respiration?
carbon dioxide
Correct answer: oxygen
water vapour
Q3.
Which piece of equipment is used to measure time?
clock
digital mass balance
Correct answer: stopwatch
Q4.
Substances move in and out of cells through the cell .
Correct Answer: membrane, membrane.
Q5.
In which state of matter are particles not free to move?
Correct Answer: solids, solid, a solid
Q6.
How could a glass of juice be made more dilute?
add more juice
Correct answer: add more water
freeze it

6 Questions

Q1.
is the net movement of particles from an area of high concentration to an area of low concentration.
Correct Answer: Diffusion, diffusion
Q2.
Which of these is an example of diffusion?
Correct answer: a smell moving through the air
electricity moving through a wire
heat moving through a metal rod
Q3.
Diffusion happens more quickly at higher temperatures because particles have more energy in their energy store.
Correct Answer: kinetic
Q4.
Match the adaptation of alveoli to the explanation.
Correct Answer:folded structure,increases surface area

increases surface area

Correct Answer:one cell thick,short diffusion distance

short diffusion distance

Correct Answer:lots of blood vessels,increases concentration gradient

increases concentration gradient

Q5.
Calculate the surface area to volume ratio of a cube with a side length of 10 cm. Give your answer as a decimal.
Correct Answer: 0.6
Q6.
Which two of the following are leaf adaptations for diffusion?
Correct answer: are flat
are green
Correct answer: are thin
have folded structure