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Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 51 · 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.

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  1. 1.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
  2. 2.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
  3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) dry yeast (c) warm water (d) sugar
  4. 4.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
  5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
  6. 6.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) salt (d) vinegar
  7. 7.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) a balloon (d) a magnet
  8. 8.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
  9. 9.⚖️ 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
  10. 10.🔍 Which is the odd one out? (a) sugar (b) time (c) sunlight (d) warm water
  11. 11.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold kills sugar (d) cold slows yeast down
  12. 12.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
  13. 13.⚖️ 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
  14. 14.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it grows faster (d) it glows
  15. 15.True or false: salt is something yeast does not need. (a) True (b) False
  16. 16.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) the balloon is smaller (d) it shrinks to nothing
  17. 17.⚖️ 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
  18. 18.True or false: sunlight is something yeast does not need. (a) False (b) True
  19. 19.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
  20. 20.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
  21. 21.True or false: a magnet is something yeast does not need. (a) False (b) True
  22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) False (b) True
  23. 23.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
  24. 24.True or false: sugar is something yeast does not need. (a) True (b) False
  25. 25.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
  26. 26.⚖️ 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 measure it (b) we change it (c) we keep it the same
  27. 27.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
  28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) True (b) False
  29. 29.🔍 Which is the odd one out? (a) sugar (b) time (c) vinegar (d) warm water
  30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a balloon (d) turmeric powder
  31. 31.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
  32. 32.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) a magnet (d) warm water
  33. 33.True or false: warm water is something yeast needs. (a) True (b) False
  34. 34.🍞 Which of these is something yeast does not need? (a) sugar (b) vinegar (c) time (d) warm water
  35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) False (b) True
  36. 36.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
  37. 37.⚖️ 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
  38. 38.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
  39. 39.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
  40. 40.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) a balloon (d) a paper clip

Answer key

  1. pour it down the sink
  2. yeast does not need it
  3. a magnet
  4. not needed
  5. it grows very little
  6. time
  7. a magnet
  8. a tiny living fungus
  9. we keep it the same
  10. sunlight
  11. cold slows yeast down
  12. carbon dioxide gas
  13. True
  14. the yeast is killed
  15. True
  16. the balloon is bigger
  17. True
  18. True
  19. False
  20. to make bread rise
  21. True
  22. False
  23. needed
  24. False
  25. not needed
  26. we keep it the same
  27. needed
  28. False
  29. vinegar
  30. turmeric powder
  31. not needed
  32. warm water
  33. True
  34. vinegar
  35. False
  36. False
  37. we keep it the same
  38. yeast needs it
  39. True
  40. a balloon

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