Diffusion | Science | Quizalize & Oak National Academy

Starter quiz

Which particle diagram shows a substance in the solid state?
- a
- b ✓
- c
Which of these are mixtures?
- oxygen
- air ✓
- orange squash ✓
- pure water
- carbon dioxide
If a gas was placed into a container, what would you expect the gas particles to do?
- The particles would collect on one side of the container.
- The particles would sink to the bottom of the container.
- The particles would spread to fill the container. ✓
Match the following scientific keywords with the correct description.
- gas state particles
  
  ⇔
  
  are randomly moving and take the shape of the container ✓
- liquid state particles
  
  ⇔
  
  are randomly moving and have no fixed shape ✓
- solid state particles
  
  ⇔
  
  are vibrating and have a fixed shape ✓
- mixture
  
  ⇔
  
  two or more substances that can be physically separated ✓
- solution
  
  ⇔
  
  formed when a substance dissolves in a liquid ✓
- fluid
  
  ⇔
  
  a substance which flows and can be a gas or a liquid ✓
What is the scientific term used to describe a substance whose particles can be pushed together into a smaller volume?
- 'compressible' ✓
What is the correct working out to show how much solute was used with 145.63 g of water to create a solution with mass 147.59 g?
- 147.59 + 145.63 = mass of solute
- mass of solute = 145.63 - 147.59
- mass of solute = 147.59 - 145.63 ✓
- 145.63 x 147.59 = mass of solute

Which word best describes when something happens without a clear, predictable pattern?
- casual
- particular
- specific
- random ✓
The random movement of particles due to collisions in a fluid is known as ______ motion.
- 'Brownian' ✓
What is the name given to a material that other substances mix into or move through?
- 'medium' ✓
Jacob is sat in his first floor bedroom. He can smell bread baking in the kitchen on the ground floor. This is due to the process of ______.
- 'diffusion' ✓
Which of the following is a true statement about how quickly diffusion occurs?
- Only the temperature of the medium will affect it.
- Only the temperature of the diffusing substance will affect it.
- The temperature of both the diffusing substance and the medium will affect it. ✓
- Temperature does not affect how quickly diffusion occurs.
Complete the 3 sentences describing what is happening in the picture: The ink and water particles are ____ moving. They ____ together and this causes them to mix. The ink will ____ through the water.
- not, hit, spread
- freely, collide, spread ✓
- freely, smash, compress
- not, collide, spread

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Brownian motion is the random motion of particles suspended in a medium.
Particles of a substance released into a fluid (a gas or liquid) move around and are pushed by other particles.
Substances that have particles that are free to move will eventually reach a random distribution throughout.
At higher temperatures, particles in a gas or solution move more quickly.

Pupil confuse diffusion and Brownian motion.

Brownian motion is the random movement of particles due to collisions. Diffusion is due to concentration differences between 2 substances.

Diffusion - The movement of particles from an area where there are lots, until there is a random distribution of particles throughout a medium.
Random - Happens without a clear pattern, making it unpredictable.
Brownian motion - The random movement of particles in a fluid, due to colliding with particles in the surrounding medium.
Medium - A medium is usually a liquid or gas that other substances can mix into or move through, enabling other substances to mix or interact.
Fluid - A fluid is a substance that flows or takes the shape of its container. Liquids and gases can be described as fluids.