Diffusion

Question 1

Diffusion: which statement is NOT true?

• A. A larger surface area speeds up diffusion.
• B. Diffusion stops completely when the room is cold.
• C. A steeper concentration gradient gives faster diffusion.
• D. Diffusion happens in gases and liquids.

Question 2

Agar cubes containing indicator were put into acid. Time for the whole cube to change colour: 1 cm cube 6 min, 2 cm cube 16 min, 3 cm cube 18 min. Which cube's centre was reached fastest by the acid?

• A. the 1 cm cube
• B. the 2 cm cube
• C. the 3 cm cube

Question 3

Someone opens a bottle of perfume in one corner of a still room. Soon it is smelled everywhere. Why?

• A. The perfume becomes a solid
• B. Perfume particles are pulled by gravity
• C. Air particles stop moving
• D. Perfume particles diffuse from high to low concentration

Question 4

Diffusion: which statement is NOT true?

• A. Particles stop moving once they are evenly spread.
• B. A larger surface area speeds up diffusion.
• C. A steeper concentration gradient gives faster diffusion.
• D. Diffusion happens in gases and liquids.

Question 5

Agar cubes containing indicator were put into acid. Time for the whole cube to change colour: 1 cm cube 6 min, 2 cm cube 16 min, 3 cm cube 24 min. Which cube's centre was reached fastest by the acid?

• A. the 1 cm cube
• B. the 2 cm cube
• C. the 3 cm cube

Question 6

Someone opens a bottle of perfume in one corner of a still room. Soon it is smelled everywhere. Why?

• A. Perfume particles are pulled by gravity
• B. The perfume becomes a solid
• C. Air particles stop moving
• D. Perfume particles diffuse from high to low concentration

Question 7

Diffusion: which statement is NOT true?

• A. A larger surface area speeds up diffusion.
• B. A steeper concentration gradient gives faster diffusion.
• C. Particles stop moving once they are evenly spread.
• D. Diffusion does not need energy from respiration.

Question 8

Agar cubes containing indicator were put into acid. Time for the whole cube to change colour: 1 cm cube 8 min, 2 cm cube 16 min, 3 cm cube 18 min. Which cube's centre was reached fastest by the acid?

• A. the 1 cm cube
• B. the 2 cm cube
• C. the 3 cm cube

Question 9

Which change would make diffusion faster?

• A. a smaller surface area
• B. a higher temperature
• C. a thicker membrane
• D. a lower temperature

Question 10

Diffusion: which statement is NOT true?

• A. A larger surface area speeds up diffusion.
• B. Diffusion happens in gases and liquids.
• C. Particles stop moving once they are evenly spread.
• D. Diffusion does not need energy from respiration.

Question 11

Agar cubes containing indicator were put into acid. Time for the whole cube to change colour: 1 cm cube 6 min, 2 cm cube 16 min, 3 cm cube 18 min. Which cube's centre was reached fastest by the acid?

• A. the 1 cm cube
• B. the 2 cm cube
• C. the 3 cm cube

Question 12

Which change would make diffusion faster?

• A. a thicker membrane
• B. a higher temperature
• C. a smaller surface area
• D. a lower temperature

Question 13

Diffusion: which statement is NOT true?

• A. Diffusion happens in gases and liquids.
• B. Particles stop moving once they are evenly spread.
• C. A larger surface area speeds up diffusion.
• D. A steeper concentration gradient gives faster diffusion.

Question 14

Purple dye spread 9 mm through a block of jelly in 2 hours. What was the mean rate of diffusion, in mm per hour?

Answer mm/h

Question 15

Which change would make diffusion faster?

• A. a higher temperature
• B. a thicker membrane
• C. a lower temperature
• D. a smaller surface area

Question 16

Diffusion: which statement is NOT true?

• A. Diffusion moves particles from low to high concentration.
• B. Diffusion does not need energy from respiration.
• C. A steeper concentration gradient gives faster diffusion.
• D. A larger surface area speeds up diffusion.