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Osmosis and percentage change in mass

8th grade (Year 9 in England) · 16 questions · Common Core: NGSS.HS-LS1-3, NGSS.SEP 5 · England: GCSE Combined Science: Cell biology (required practical: osmosis)

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  1. Question 1

    Fresh flowers are put in a vase of very salty water. What will happen?

    • A. They wilt, because water leaves their cells by osmosis
    • B. Nothing, because flowers are not alive
    • C. They grow faster
    • D. They absorb the salt and stay firm

  2. Question 2

    A potato cylinder had a mass of 2 g. After 30 minutes in a sugar solution its mass was 2.4 g. What is the percentage change in mass? (Use a minus sign for a loss.)

    Answer%

  3. Question 3

    Potato pieces were left in sugar solutions. Percentage change in mass: 0 mol/dm³: +35 % 0.2 mol/dm³: +25 % 0.4 mol/dm³: +15 % 0.6 mol/dm³: +5 % 0.8 mol/dm³: −5 % Between which concentrations is the solution that matches the concentration inside the potato cells?

    • A. 0–0.2 mol/dm³
    • B. 0.2–0.4 mol/dm³
    • C. 0.4–0.6 mol/dm³
    • D. 0.6–0.8 mol/dm³

  4. Question 4

    Cucumber slices sprinkled with salt become limp and watery. Why?

    • A. The cucumber starts to photosynthesise
    • B. Water leaves the cells by osmosis into the more concentrated salty surface
    • C. Salt particles push water out by force
    • D. Salt enters and the cells burst

  5. Question 5

    A potato cylinder had a mass of 4 g. After 30 minutes in a sugar solution its mass was 4.5 g. What is the percentage change in mass? (Use a minus sign for a loss.)

    Answer%

  6. Question 6

    Potato pieces were left in sugar solutions. Percentage change in mass: 0 mol/dm³: +35 % 0.2 mol/dm³: +25 % 0.4 mol/dm³: +15 % 0.6 mol/dm³: +5 % 0.8 mol/dm³: −5 % Between which concentrations is the solution that matches the concentration inside the potato cells?

    • A. 0–0.2 mol/dm³
    • B. 0.2–0.4 mol/dm³
    • C. 0.4–0.6 mol/dm³
    • D. 0.6–0.8 mol/dm³

  7. Question 7

    A red blood cell is placed in pure water. What happens?

    • A. It shrinks
    • B. Nothing changes
    • C. It grows a cell wall
    • D. It swells and may burst because water enters by osmosis

  8. Question 8

    A potato cylinder had a mass of 3.2 g. After 30 minutes in a sugar solution its mass was 3.84 g. What is the percentage change in mass? (Use a minus sign for a loss.)

    Answer%

  9. Question 9

    Potato pieces were left in sugar solutions. Percentage change in mass: 0 mol/dm³: +15 % 0.2 mol/dm³: +9 % 0.4 mol/dm³: +3 % 0.6 mol/dm³: −3 % 0.8 mol/dm³: −9 % Between which concentrations is the solution that matches the concentration inside the potato cells?

    • A. 0–0.2 mol/dm³
    • B. 0.2–0.4 mol/dm³
    • C. 0.4–0.6 mol/dm³
    • D. 0.6–0.8 mol/dm³

  10. Question 10

    Fresh flowers are put in a vase of very salty water. What will happen?

    • A. They wilt, because water leaves their cells by osmosis
    • B. Nothing, because flowers are not alive
    • C. They grow faster
    • D. They absorb the salt and stay firm

  11. Question 11

    A potato cylinder had a mass of 2.4 g. After 30 minutes in a sugar solution its mass was 2.88 g. What is the percentage change in mass? (Use a minus sign for a loss.)

    Answer%

  12. Question 12

    Potato pieces were left in sugar solutions. Percentage change in mass: 0 mol/dm³: +12 % 0.2 mol/dm³: +4 % 0.4 mol/dm³: −4 % 0.6 mol/dm³: −12 % 0.8 mol/dm³: −20 % Between which concentrations is the solution that matches the concentration inside the potato cells?

    • A. 0–0.2 mol/dm³
    • B. 0.2–0.4 mol/dm³
    • C. 0.4–0.6 mol/dm³
    • D. 0.6–0.8 mol/dm³

  13. Question 13

    Cucumber slices sprinkled with salt become limp and watery. Why?

    • A. Salt particles push water out by force
    • B. Salt enters and the cells burst
    • C. Water leaves the cells by osmosis into the more concentrated salty surface
    • D. The cucumber starts to photosynthesise

  14. Question 14

    A potato cylinder had a mass of 4 g. After 30 minutes in a sugar solution its mass was 3.4 g. What is the percentage change in mass? (Use a minus sign for a loss.)

    Answer%

  15. Question 15

    Potato pieces were left in sugar solutions. Percentage change in mass: 0 mol/dm³: +15 % 0.2 mol/dm³: +5 % 0.4 mol/dm³: −5 % 0.6 mol/dm³: −15 % 0.8 mol/dm³: −25 % Between which concentrations is the solution that matches the concentration inside the potato cells?

    • A. 0–0.2 mol/dm³
    • B. 0.2–0.4 mol/dm³
    • C. 0.4–0.6 mol/dm³
    • D. 0.6–0.8 mol/dm³

  16. Question 16

    Why does a plant cell in pure water not burst?

    • A. Its strong cell wall stops it expanding too far, so it becomes turgid
    • B. It cannot take in water
    • C. Its vacuole pumps water out
    • D. Chloroplasts absorb the water

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Answer key: Osmosis and percentage change in mass

  1. 1. A. They wilt, because water leaves their cells by osmosis

  2. 2. 20 %

  3. 3. D. 0.6–0.8 mol/dm³

  4. 4. B. Water leaves the cells by osmosis into the more concentrated salty surface

  5. 5. 12.5 %

  6. 6. D. 0.6–0.8 mol/dm³

  7. 7. D. It swells and may burst because water enters by osmosis

  8. 8. 20 %

  9. 9. C. 0.4–0.6 mol/dm³

  10. 10. A. They wilt, because water leaves their cells by osmosis

  11. 11. 20 %

  12. 12. B. 0.2–0.4 mol/dm³

  13. 13. C. Water leaves the cells by osmosis into the more concentrated salty surface

  14. 14. -15 %

  15. 15. B. 0.2–0.4 mol/dm³

  16. 16. A. Its strong cell wall stops it expanding too far, so it becomes turgid