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Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 426 · 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.⚖️ 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) True (b) False
  2. 2.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
  3. 3.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
  4. 4.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
  5. 5.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
  6. 6.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
  7. 7.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a comb (d) warm water
  8. 8.🍞 Which of these is something yeast does not need? (a) warm water (b) sunlight (c) time (d) sugar
  9. 9.⚖️ 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) False (b) True
  10. 10.⚖️ 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 sugar (b) the water temperature (c) the amount of yeast (d) the amount of water
  11. 11.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) vinegar (d) salt
  12. 12.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
  13. 13.True or false: vinegar is something yeast needs. (a) False (b) True
  14. 14.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it turns to bread (d) it shrinks to nothing
  15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) sugar (d) a small bottle
  16. 16.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
  17. 17.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a kind of stone (d) a tiny living fungus
  18. 18.True or false: salt is something yeast does not need. (a) True (b) False
  19. 19.True or false: time is something yeast does not need. (a) False (b) True
  20. 20.🔍 Which is the odd one out? (a) vinegar (b) time (c) salt (d) sunlight
  21. 21.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
  22. 22.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
  23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the amount of sugar (c) the amount of yeast (d) size of the balloon
  24. 24.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) warm water (d) a magnet
  25. 25.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
  26. 26.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold slows yeast down (d) cold makes it pink
  27. 27.🔍 Which is the odd one out? (a) time (b) a magnet (c) sugar (d) warm water
  28. 28.True or false: warm water is needed for the yeast balloon. (a) False (b) True
  29. 29.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
  30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) turmeric powder (c) a small bottle (d) warm water
  31. 31.🔮 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
  32. 32.🍞 Which of these is something yeast does not need? (a) salt (b) time (c) warm water (d) sugar
  33. 33.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
  34. 34.⚖️ 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 change it (b) we measure it (c) we keep it the same
  35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
  36. 36.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) time (d) sugar
  37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a balloon (d) a paper clip
  38. 38.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
  39. 39.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a comb (c) a mirror (d) a magnet
  40. 40.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed

Answer key

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

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