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Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 22 · 40 questions
TalentJR

What you do (Yeast is alive): 1. Pour warm (not hot) water into the bottle — an adult checks it. 2. Add the yeast and the sugar and swirl gently. 3. Stretch the balloon over the bottle’s mouth. 4. Wait 30 minutes, measure the balloon, then pour the mixture away and wash up.

NameDateTime takenScore ___ / 40
  1. 1.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
  2. 2.True or false: warm water is something yeast does not need. (a) True (b) False
  3. 3.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
  4. 4.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a mirror (d) dry yeast
  5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it turns yellow (d) it bursts at once
  6. 6.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
  7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a balloon (d) a mirror
  8. 8.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
  9. 9.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) salt (d) time
  10. 10.🍞 Which of these is something yeast does not need? (a) vinegar (b) warm water (c) time (d) sugar
  11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) False (b) True
  12. 12.🍞 Which of these is something yeast needs? (a) vinegar (b) time (c) salt (d) a magnet
  13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) turmeric powder (d) dry yeast
  14. 14.True or false: sunlight is something yeast needs. (a) True (b) False
  15. 15.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
  16. 16.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a magnet (c) a mirror (d) a paper clip
  17. 17.True or false: sugar is something yeast needs. (a) True (b) False
  18. 18.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
  19. 19.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) keep it for a month (d) put it in your mouth
  20. 20.🔍 Which is the odd one out? (a) salt (b) sunlight (c) sugar (d) vinegar
  21. 21.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
  22. 22.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) it turns to bread (d) the balloon is smaller
  23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of water (c) size of the balloon (d) the same bottles
  24. 24.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
  25. 25.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to colour rice (d) to clean floors
  26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a battery cell (d) a small bottle
  27. 27.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) sunlight (d) salt
  28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) the water temperature (c) size of the balloon
  29. 29.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
  30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
  31. 31.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) warm water (d) salt
  32. 32.True or false: a magnet is something yeast needs. (a) False (b) True
  33. 33.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows
  34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we keep it the same (b) we change it (c) we measure it
  35. 35.True or false: time is something yeast does not need. (a) False (b) True
  36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we keep it the same (b) we change it (c) we measure it
  37. 37.🔍 Which is the odd one out? (a) sugar (b) warm water (c) a magnet (d) time
  38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the water temperature”? (a) we keep it the same (b) we measure it (c) we change it
  39. 39.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
  40. 40.True or false: a magnet is something yeast does not need. (a) True (b) False

Answer key

  1. False
  2. False
  3. not needed
  4. dry yeast
  5. it grows very little
  6. warm, not hot
  7. a mirror
  8. False
  9. salt
  10. vinegar
  11. True
  12. time
  13. turmeric powder
  14. False
  15. not needed
  16. sugar
  17. True
  18. needed
  19. pour it down the sink
  20. sugar
  21. yeast does not need it
  22. the balloon is bigger
  23. size of the balloon
  24. yeast does not need it
  25. to make bread rise
  26. a battery cell
  27. warm water
  28. the same bottles
  29. yeast needs it
  30. False
  31. warm water
  32. False
  33. the yeast is killed
  34. we measure it
  35. False
  36. we keep it the same
  37. a magnet
  38. we change it
  39. needed
  40. True

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