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Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 761 · 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.🔍 Which is the odd one out? (a) salt (b) a magnet (c) warm water (d) sunlight
  2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) sugar (c) a balloon (d) dry yeast
  3. 3.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) a mirror (d) sugar
  4. 4.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
  5. 5.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
  6. 6.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
  7. 7.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
  8. 8.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
  9. 9.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
  10. 10.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
  11. 11.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to clean floors (d) to wash dishes
  12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is the one thing we change? (a) the water temperature (b) the amount of water (c) the amount of sugar (d) the amount of yeast
  13. 13.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) salt
  14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a mirror (c) warm water (d) sugar
  15. 15.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) warm water (d) sugar
  16. 16.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
  17. 17.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it glows (d) it grows faster
  18. 18.True or false: vinegar is something yeast does not need. (a) False (b) True
  19. 19.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a kind of stone (d) a tiny living fungus
  20. 20.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
  21. 21.True or false: a magnet is something yeast does not need. (a) True (b) False
  22. 22.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) air from outside (d) smoke
  23. 23.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
  24. 24.True or false: warm water is needed for the yeast balloon. (a) True (b) False
  25. 25.True or false: warm water is something yeast does not need. (a) True (b) False
  26. 26.⚖️ 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 change it (b) we keep it the same (c) we measure it
  27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) turmeric powder (d) a balloon
  28. 28.🍞 Which of these is something yeast needs? (a) time (b) salt (c) sunlight (d) vinegar
  29. 29.True or false: sugar is something yeast does not need. (a) True (b) False
  30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of yeast (b) the same bottles (c) size of the balloon (d) the amount of water
  31. 31.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
  32. 32.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
  33. 33.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to colour it (d) to make it heavy
  34. 34.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
  35. 35.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
  36. 36.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
  37. 37.⚖️ 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 measure it (c) we change it
  38. 38.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
  39. 39.True or false: a comb is needed for the yeast balloon. (a) False (b) True
  40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) warm water (d) sugar

Answer key

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

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