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Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 971 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) turmeric powder (d) sugar
  2. 2.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
  3. 3.🔍 Which is the odd one out? (a) salt (b) vinegar (c) a magnet (d) sugar
  4. 4.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) the balloon is bigger (d) it turns to bread
  5. 5.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
  6. 6.⚖️ 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
  7. 7.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
  8. 8.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
  9. 9.⚖️ 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 same bottles (c) size of the balloon (d) the water temperature
  10. 10.True or false: warm water is something yeast needs. (a) True (b) False
  11. 11.True or false: sunlight is something yeast needs. (a) True (b) False
  12. 12.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
  13. 13.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
  14. 14.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold kills sugar (c) cold water is heavy (d) cold makes it pink
  15. 15.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
  16. 16.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to clean floors (d) to make bread rise
  17. 17.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
  18. 18.⚖️ 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
  19. 19.⚖️ 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) True (b) False
  20. 20.⚖️ 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 change it (c) we measure it
  21. 21.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
  22. 22.⚖️ 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 keep it the same (c) we measure it
  23. 23.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) warm water (c) turmeric powder (d) a battery cell
  24. 24.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) a magnet (d) time
  25. 25.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
  26. 26.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
  27. 27.True or false: warm water is something yeast does not need. (a) False (b) True
  28. 28.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
  29. 29.True or false: a magnet is something yeast does not need. (a) True (b) False
  30. 30.True or false: salt is something yeast does not need. (a) True (b) False
  31. 31.🍞 Which of these is something yeast needs? (a) salt (b) sugar (c) a magnet (d) sunlight
  32. 32.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) time (d) salt
  33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) warm water (d) a mirror
  34. 34.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) dry yeast (c) a paper clip (d) a battery cell
  35. 35.⚖️ 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
  36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a magnet (d) a small bottle
  37. 37.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
  38. 38.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
  39. 39.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a magnet (c) dry yeast (d) a small bottle
  40. 40.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) vinegar

Answer key

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

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