Diffusion Video, Notes and Quiz

Imagine you've sprayed perfume in one corner of a room. What process describes how the scent spreads throughout the room?

• The net movement of perfume molecules from an area of lower concentration to an area of higher concentration

• The movement of perfume molecules in a solid

• The net movement of perfume molecules from an area of higher concentration to an area of lower concentration

• The process by which perfume molecules stand still in the air

Imagine a scenario where a cell is surrounded by various molecules. Which of the following molecules can naturally diffuse through the cell membrane?

• Starch

• DNA

• Proteins

• Water

Imagine a kitchen sieve. What does it mean if we say the sieve is 'partially permeable'?

• Allows only large particles like rice to pass through, but not water

• Allows both water and rice to pass through

• Allows only small particles like water to pass through, but not rice

• Does not allow either water or rice to pass through

How does the temperature of water affect the diffusion of sugar dissolved in it?

• Lower temperatures increase the rate at which sugar dissolves in water

• Temperature has no effect on the rate at which sugar dissolves in water

• Higher temperatures decrease the rate at which sugar dissolves in water

• Higher temperatures increase the rate at which sugar dissolves in water

Imagine you spray perfume in one corner of a room. What does 'net movement' of perfume molecules mean in this context?

• The movement of perfume molecules in one direction only

• The movement of all the perfume molecules considered together as a group

• The movement of perfume molecules against the concentration gradient

• The movement of perfume molecules without any energy

Imagine you are experimenting with the diffusion of perfume in a room. Which of the following factors does NOT affect the rate at which the perfume scent spreads throughout the room?

• Temperature of the room

• Size of the room (surface area)

• Amount of perfume sprayed (concentration gradient)

• Color of the perfume

How does increasing the surface area of a sugar cube by crushing it affect the rate at which it dissolves in water?

• Decreases the rate of dissolution

• Has no effect on the rate of dissolution

• Changes the direction of dissolution

• Increases the rate of dissolution

Why is diffusion considered a passive process?

• It can only happen in liquids

• It does not require any energy from the cell

• It only occurs in living organisms

• It requires external energy to occur

Imagine you open a bottle of perfume in a room. What happens to the perfume molecules?

• They move from an area of low concentration to an area of high concentration randomly

• They remain stationary

• They move in a fixed direction without random motion

• They move from an area of high concentration to an area of low concentration randomly

Which of the following statements is true about diffusion?

• It can only occur in gases

• It requires cellular energy to happen

• It results in particles being unevenly distributed

• It can happen in both gases and liquids