# 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 cm2 and a volume of 1 cm3. Cube B has a surface area of 24 cm2 and a volume of 8 cm3.

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

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