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Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 825 · 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.

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  1. 1.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) the yeast is killed (d) it grows faster
  2. 2.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
  3. 3.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a battery cell (d) dry yeast
  4. 4.True or false: vinegar is something yeast does not need. (a) False (b) True
  5. 5.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
  6. 6.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
  7. 7.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
  8. 8.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) time (d) sugar
  9. 9.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a magnet (c) a paper clip (d) turmeric powder
  10. 10.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) sugar (d) a magnet
  11. 11.🍞 Which of these is something yeast does not need? (a) sugar (b) a magnet (c) time (d) warm water
  12. 12.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
  13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we keep it the same (b) we measure it (c) we change it
  14. 14.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
  15. 15.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
  16. 16.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
  17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) turmeric powder (d) sugar
  18. 18.True or false: sunlight is something yeast needs. (a) True (b) False
  19. 19.True or false: warm water is needed for the yeast balloon. (a) True (b) False
  20. 20.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
  21. 21.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a magnet (c) a comb (d) warm water
  22. 22.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a tiny living fungus (d) a kind of salt
  23. 23.True or false: vinegar is something yeast needs. (a) False (b) True
  24. 24.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
  25. 25.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
  26. 26.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
  27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we keep it the same (b) we change it (c) we measure it
  28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
  29. 29.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
  30. 30.⚖️ 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) True (b) False
  31. 31.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) a balloon (d) sugar
  32. 32.⚖️ 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
  33. 33.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
  34. 34.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to wash dishes (d) to colour rice
  35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we measure it (b) we change it (c) we keep it the same
  36. 36.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
  37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
  38. 38.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) sunlight
  39. 39.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) warm water (d) time
  40. 40.True or false: a comb is not needed for the yeast balloon. (a) True (b) False

Answer key

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

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