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?

  • A31
  • B61
  • C21
  • D41

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

  • A31
  • B21
  • C61
  • D41

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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