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Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 398 · 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.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold kills sugar (c) cold water is heavy (d) cold makes it pink
  2. 2.⚖️ 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) size of the balloon (b) the same bottles (c) the amount of sugar (d) the water temperature
  3. 3.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) it shrinks to nothing (d) the balloon is bigger
  4. 4.🔍 Which is the odd one out? (a) sugar (b) warm water (c) a magnet (d) time
  5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) a balloon (d) dry yeast
  6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a magnet (d) warm water
  7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) the water temperature (c) size of the balloon
  8. 8.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
  9. 9.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
  10. 10.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
  11. 11.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) time (d) sugar
  12. 12.⚖️ 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 change it (b) we keep it the same (c) we measure it
  13. 13.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) a magnet (d) salt
  14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
  15. 15.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) warm water (c) a magnet (d) a battery cell
  16. 16.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink
  17. 17.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) warm water (d) vinegar
  18. 18.🍞 Which of these is something yeast does not need? (a) salt (b) sugar (c) time (d) warm water
  19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a comb (d) sugar
  20. 20.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
  21. 21.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a mirror (d) warm water
  22. 22.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
  23. 23.⚖️ 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
  24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
  25. 25.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a magnet (d) warm water
  26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) turmeric powder (d) sugar
  27. 27.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
  28. 28.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) carbon dioxide gas (d) air from outside
  29. 29.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
  30. 30.True or false: sunlight is something yeast does not need. (a) True (b) False
  31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) sugar (c) a balloon (d) dry yeast
  32. 32.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
  33. 33.🔍 Which is the odd one out? (a) vinegar (b) time (c) salt (d) sunlight
  34. 34.True or false: sugar is needed for the yeast balloon. (a) False (b) True
  35. 35.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
  36. 36.True or false: warm water is something yeast does not need. (a) True (b) False
  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.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
  39. 39.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a mirror (c) a balloon (d) a magnet
  40. 40.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed

Answer key

  1. cold slows yeast down
  2. the water temperature
  3. the balloon is bigger
  4. a magnet
  5. a paper clip
  6. a magnet
  7. the amount of water
  8. not needed
  9. True
  10. not needed
  11. vinegar
  12. we measure it
  13. sugar
  14. True
  15. warm water
  16. pour it down the sink
  17. warm water
  18. salt
  19. a comb
  20. False
  21. a mirror
  22. False
  23. True
  24. False
  25. a magnet
  26. turmeric powder
  27. not needed
  28. carbon dioxide gas
  29. yeast needs it
  30. True
  31. a battery cell
  32. not needed
  33. time
  34. True
  35. warm, not hot
  36. False
  37. True
  38. yeast does not need it
  39. a balloon
  40. needed

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