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Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 640 · 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? What do we do with “the water temperature”? (a) we change it (b) we keep it the same (c) we measure it
  2. 2.⚖️ 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 water (c) the amount of yeast (d) size of the balloon
  3. 3.🔍 Which is the odd one out? (a) salt (b) sunlight (c) time (d) a magnet
  4. 4.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to colour rice (d) to make bread rise
  5. 5.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
  6. 6.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) sunlight
  7. 7.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
  8. 8.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a comb (c) a magnet (d) a balloon
  9. 9.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
  10. 10.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) warm water (d) turmeric powder
  11. 11.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) vinegar
  12. 12.⚖️ 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
  13. 13.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
  14. 14.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
  15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a balloon (d) a paper clip
  16. 16.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
  17. 17.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
  18. 18.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) time (d) vinegar
  19. 19.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to colour it (d) to make it heavy
  20. 20.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
  21. 21.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
  22. 22.🛟 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
  23. 23.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
  24. 24.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it grows very little (d) it turns yellow
  25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a small bottle (d) a comb
  26. 26.⚖️ 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) the amount of water (c) size of the balloon
  27. 27.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sugar (d) a magnet
  28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
  29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) True (b) False
  30. 30.True or false: sugar is something yeast does not need. (a) False (b) True
  31. 31.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
  32. 32.⚖️ 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 yeast (b) size of the balloon (c) the water temperature
  33. 33.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
  34. 34.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) smoke (d) air from outside
  35. 35.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
  36. 36.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold water is heavy (d) cold slows yeast down
  37. 37.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
  38. 38.True or false: warm water is something yeast does not need. (a) True (b) False
  39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a balloon (c) warm water (d) sugar
  40. 40.⚖️ 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 measure it (c) we keep it the same

Answer key

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

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