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Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 722 · 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) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
  2. 2.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
  3. 3.True or false: vinegar is something yeast does not need. (a) False (b) True
  4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a magnet (d) dry yeast
  5. 5.🔍 Which is the odd one out? (a) vinegar (b) time (c) salt (d) a magnet
  6. 6.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) the balloon is bigger (d) it shrinks to nothing
  7. 7.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
  8. 8.⚖️ 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) False (b) True
  9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the amount of yeast
  10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a mirror (d) a balloon
  11. 11.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
  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.🍞 Which of these is something yeast does not need? (a) vinegar (b) time (c) warm water (d) sugar
  14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) turmeric powder (d) sugar
  15. 15.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
  16. 16.True or false: sugar is something yeast does not need. (a) True (b) False
  17. 17.True or false: warm water is something yeast does not need. (a) True (b) False
  18. 18.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
  19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) dry yeast (c) sugar (d) warm water
  20. 20.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
  21. 21.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) sunlight (d) warm water
  22. 22.True or false: salt is something yeast needs. (a) True (b) False
  23. 23.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a small bottle (d) a comb
  24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
  25. 25.True or false: a magnet is something yeast does not need. (a) True (b) False
  26. 26.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
  27. 27.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to wash dishes (d) to colour rice
  28. 28.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
  29. 29.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
  30. 30.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a magnet (d) a small bottle
  31. 31.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
  32. 32.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) a magnet (d) sugar
  33. 33.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
  34. 34.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
  35. 35.True or false: a comb is needed for the yeast balloon. (a) False (b) True
  36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
  37. 37.⚖️ 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
  38. 38.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
  39. 39.⚖️ 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) size of the balloon (b) the amount of yeast (c) the water temperature (d) the same bottles
  40. 40.⚖️ 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 keep it the same (b) we change it (c) we measure it

Answer key

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

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