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Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 650 · 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) pour it down the sink (b) put it in your mouth (c) throw it at a wall (d) keep it for a month
  2. 2.True or false: sugar is something yeast does not need. (a) True (b) False
  3. 3.🔍 Which is the odd one out? (a) time (b) sugar (c) sunlight (d) warm water
  4. 4.⚖️ 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) size of the balloon (c) the water temperature
  5. 5.⚖️ 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 keep it the same (b) we measure it (c) we change it
  6. 6.🔍 Which is the odd one out? (a) warm water (b) sugar (c) a magnet (d) time
  7. 7.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
  8. 8.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) a magnet (d) sugar
  9. 9.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) warm water (d) a paper clip
  10. 10.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
  11. 11.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
  12. 12.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
  13. 13.True or false: salt is something yeast needs. (a) False (b) True
  14. 14.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
  15. 15.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
  16. 16.🔮 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
  17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) dry yeast (c) a balloon (d) sugar
  18. 18.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
  19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a magnet (d) dry yeast
  20. 20.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) dry yeast (d) a mirror
  21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) warm water (c) sugar (d) dry yeast
  22. 22.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) boiling hot (d) very salty
  23. 23.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) warm water (d) salt
  24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
  25. 25.⚖️ 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 keep it the same (b) we change it (c) we measure it
  26. 26.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a paper clip (c) dry yeast (d) warm water
  27. 27.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
  28. 28.True or false: sunlight is something yeast does not need. (a) False (b) True
  29. 29.⚖️ 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 change it (b) we measure it (c) we keep it the same
  30. 30.⚖️ 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) True (b) False
  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.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
  33. 33.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) salt (d) vinegar
  34. 34.🔍 Which is the odd one out? (a) a magnet (b) salt (c) time (d) vinegar
  35. 35.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a small bottle (c) a mirror (d) turmeric powder
  36. 36.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
  37. 37.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) it is food for yeast (d) to make it heavy
  38. 38.⚖️ 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 yeast (b) the water temperature (c) size of the balloon (d) the amount of sugar
  39. 39.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
  40. 40.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False

Answer key

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

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