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Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 100 · 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.True or false: time is something yeast does not need. (a) True (b) False
  2. 2.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
  3. 3.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it bursts at once (d) it grows much faster
  4. 4.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a comb (d) a small bottle
  5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
  6. 6.⚖️ 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 keep it the same (b) we change it (c) we measure it
  7. 7.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) a magnet
  8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a balloon (d) a paper clip
  9. 9.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
  10. 10.🔍 Which is the odd one out? (a) time (b) salt (c) a magnet (d) vinegar
  11. 11.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
  12. 12.🍞 Which of these is something yeast needs? (a) time (b) sunlight (c) vinegar (d) a magnet
  13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) sugar (c) warm water (d) a balloon
  14. 14.⚖️ 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 change it (c) we keep it the same
  15. 15.🔍 Which is the odd one out? (a) sunlight (b) salt (c) warm water (d) a magnet
  16. 16.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) warm water (d) a mirror
  17. 17.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
  18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) a small bottle (c) warm water (d) dry yeast
  19. 19.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
  20. 20.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
  21. 21.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
  22. 22.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a mirror (c) sugar (d) a magnet
  23. 23.True or false: vinegar is something yeast needs. (a) False (b) True
  24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of yeast (b) the amount of sugar (c) size of the balloon (d) the water temperature
  25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we change it (b) we measure it (c) we keep it the same
  26. 26.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
  27. 27.True or false: a magnet is something yeast needs. (a) True (b) False
  28. 28.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold makes it pink (d) cold slows yeast down
  29. 29.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
  30. 30.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
  31. 31.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
  32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
  33. 33.🍞 Which of these is something yeast does not need? (a) a magnet (b) time (c) sugar (d) warm water
  34. 34.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a battery cell (c) turmeric powder (d) a magnet
  35. 35.True or false: time is something yeast needs. (a) False (b) True
  36. 36.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
  37. 37.True or false: warm water is something yeast does not need. (a) False (b) True
  38. 38.⚖️ 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) False (b) True
  39. 39.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) sunlight (d) warm water
  40. 40.🍞 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

Answer key

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

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