# Worksheet: Diffusion

In this worksheet, we will practice describing diffusion and explaining the effect of limiting factors on the rate of diffusion.

**Q1: **

Two students are discussing the effect of concentration gradient on diffusion. Student A says, “The higher the concentration gradient, the slower the rate of diffusion.“ But student B thinks the opposite. Who is correct?

- AStudent A
- BStudent B

**Q2: **

Fill in the blank: The term given to the difference between two areas of concentration is the concentration .

- Adifference
- Bcoordinate
- Cgraduation
- Dgradient
- Eopposition

**Q3: **

Diffusion allows substances to move. Which of the following is the best description of diffusion?

- AThe net movement of solutes
- BThe movement of particles against the concentration gradient using energy
- CThe net movement of particles from an area of high concentration to an area of low concentration
- DThe net movement of particles from an area of low concentration to an area of high concentration
- EThe movement of water particles from an area of high concentration to an area of low concentration

**Q4: **

Which of the following has no effect on the rate of diffusion?

- AConcentration gradient
- BTemperature
- CColor of particles
- DLength of the diffusion pathway
- ESurface area

**Q5: **

Which of the following statements about the movement of particles is correct?

- AParticles move in predefined tracks.
- BParticles move less when they are heated up.
- CParticles in gases have strong forces of attraction with each other.
- DParticles move randomly.
- EThe net movement of particles will be from an area of low concentration to an area of high concentration.

**Q6: **

Which of the following best explains how an increase in temperature affects the rate of diffusion?

- AWith an increase in temperature, the particles turn into a gas and move to areas of low concentration quickly.
- BAn increase in temperature means the particles gain more gravitational potential energy, so they move faster from the area of high concentration.
- CAn increase in temperature provides particles with more kinetic energy, so they move down the concentration gradient slower.
- DAn increase in temperature provides particles with more kinetic energy, so they move down the concentration gradient faster.

**Q7: **

Two students carry out an investigation of the effect of surface area on diffusion.

They place two cubes of agar in a beaker of dye and time how long it takes for the agar to fully change color.

Cube A has a surface area of 6 cm^{2} and a volume of 1 cm^{3}.
Cube B has a surface area of 24 cm^{2} and a volume of 8 cm^{3}.

What is the ratio between the surface area and volume of cube A?

- A
- B
- C
- D

What is the ratio between the surface area and volume of cube B?

- A
- B
- C
- D

Which cube will change color quicker?

- ACube A
- BCube B

In this experiment, what is the independent variable?

- ATemperature
- BTime taken
- CSurface area
- DVolume of dye
- EType of agar

What is the correlation between surface area and rate of diffusion?

- AThe smaller the surface area relative to volume, the faster the rate of diffusion.
- BSurface area has no effect on the rate of diffusion.
- CThe larger the surface area relative to volume, the faster the rate of diffusion.
- DThe larger the surface area relative to volume, the slower the rate of diffusion.

**Q8: **

Which of the diagrams (1, 2, 3, or 4) best outlines the process of diffusion?

- A1
- B2
- C4
- D3