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Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 879 · 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.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
  2. 2.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) salt (d) sugar
  3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) turmeric powder (c) warm water (d) a small bottle
  4. 4.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it turns yellow (d) it bursts at once
  5. 5.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
  6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) warm water (d) a mirror
  7. 7.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
  8. 8.🔍 Which is the odd one out? (a) salt (b) sunlight (c) vinegar (d) warm water
  9. 9.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a tiny living fungus (d) a kind of sugar
  10. 10.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
  11. 11.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
  12. 12.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) it glows (d) the yeast is killed
  13. 13.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) warm water (d) turmeric powder
  14. 14.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) throw it at a wall (d) pour it down the sink
  15. 15.⚖️ 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 keep it the same (b) we measure it (c) we change it
  16. 16.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
  17. 17.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) salt
  18. 18.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
  19. 19.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
  20. 20.True or false: sunlight is something yeast needs. (a) False (b) True
  21. 21.🔍 Which is the odd one out? (a) warm water (b) time (c) a magnet (d) sugar
  22. 22.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) vinegar (d) a magnet
  23. 23.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) warm water (d) salt
  24. 24.True or false: time is something yeast needs. (a) True (b) False
  25. 25.True or false: warm water is something yeast does not need. (a) True (b) False
  26. 26.🔍 Which is the odd one out? (a) salt (b) time (c) sunlight (d) a magnet
  27. 27.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
  28. 28.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
  29. 29.⚖️ 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 water (b) the water temperature (c) the amount of sugar (d) size of the balloon
  30. 30.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold water is heavy (d) cold slows yeast down
  31. 31.⚖️ 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 same bottles (b) the water temperature (c) the amount of yeast (d) the amount of sugar
  32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the amount of water (c) size of the balloon
  33. 33.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
  34. 34.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
  35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) True (b) False
  36. 36.⚖️ 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 measure it (b) we keep it the same (c) we change it
  37. 37.⚖️ 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
  38. 38.True or false: sugar is something yeast needs. (a) True (b) False
  39. 39.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
  40. 40.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True

Answer key

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

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