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Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 101 · 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.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
  2. 2.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it turns yellow (d) it grows very little
  3. 3.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
  4. 4.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) put it in your mouth (d) throw it at a wall
  5. 5.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) sugar (d) time
  6. 6.True or false: salt is something yeast needs. (a) True (b) False
  7. 7.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a balloon (d) a mirror
  8. 8.True or false: warm water is something yeast does not need. (a) True (b) False
  9. 9.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) a magnet (d) time
  10. 10.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
  11. 11.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a comb (d) a balloon
  12. 12.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
  13. 13.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold slows yeast down (d) cold makes it pink
  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 the one thing we change. (a) False (b) True
  15. 15.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
  16. 16.⚖️ 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 measure it (b) we keep it the same (c) we change it
  17. 17.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
  18. 18.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
  19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) dry yeast (d) a paper clip
  20. 20.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
  21. 21.🔍 Which is the odd one out? (a) salt (b) sugar (c) sunlight (d) vinegar
  22. 22.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) sunlight (d) warm water
  23. 23.⚖️ 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 measure it (b) we change it (c) we keep it the same
  24. 24.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) air from outside (d) smoke
  25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a balloon (d) a magnet
  26. 26.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
  27. 27.⚖️ 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
  28. 28.True or false: vinegar is something yeast needs. (a) True (b) False
  29. 29.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
  30. 30.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) warm water (d) time
  31. 31.⚖️ 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) True (b) False
  32. 32.True or false: sugar is needed for the yeast balloon. (a) True (b) False
  33. 33.⚖️ 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 change it (b) we measure it (c) we keep it the same
  34. 34.⚖️ 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
  35. 35.True or false: a magnet is something yeast does not need. (a) True (b) False
  36. 36.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
  37. 37.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a balloon (c) a mirror (d) turmeric powder
  38. 38.🔍 Which is the odd one out? (a) warm water (b) time (c) salt (d) sugar
  39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
  40. 40.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True

Answer key

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

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