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Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 471 · 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.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
  2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) turmeric powder (c) a balloon (d) dry yeast
  3. 3.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
  4. 4.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
  5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a small bottle (d) a paper clip
  6. 6.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam
  7. 7.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
  8. 8.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
  9. 9.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
  10. 10.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) salt
  11. 11.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
  12. 12.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) dry yeast (d) turmeric powder
  13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) size of the balloon (c) the amount of water
  14. 14.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
  15. 15.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a comb (d) sugar
  16. 16.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
  17. 17.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
  18. 18.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
  19. 19.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
  20. 20.⚖️ 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
  21. 21.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
  22. 22.True or false: a magnet is something yeast needs. (a) True (b) False
  23. 23.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
  24. 24.True or false: sunlight is something yeast needs. (a) False (b) True
  25. 25.🍞 Which of these is something yeast needs? (a) vinegar (b) sugar (c) sunlight (d) salt
  26. 26.⚖️ 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 amount of yeast (b) the water temperature (c) the amount of sugar (d) the amount of water
  27. 27.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to wash dishes (d) to colour rice
  28. 28.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
  29. 29.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) sugar (d) vinegar
  30. 30.True or false: a comb is needed for the yeast balloon. (a) False (b) True
  31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) a mirror (d) a small bottle
  32. 32.⚖️ 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 measure it (b) we keep it the same (c) we change it
  33. 33.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) it glows (d) the yeast is killed
  34. 34.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
  35. 35.True or false: warm water is something yeast does not need. (a) False (b) True
  36. 36.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) keep it for a month (d) throw it at a wall
  37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) dry yeast (d) a battery cell
  38. 38.True or false: sunlight is something yeast does not need. (a) False (b) True
  39. 39.⚖️ 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
  40. 40.🔍 Which is the odd one out? (a) a magnet (b) salt (c) time (d) sunlight

Answer key

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

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