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Yeast Balloon Experiment Worksheet

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

Answer key

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

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