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Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 272 · 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.🍞 Which of these is something yeast does not need? (a) warm water (b) vinegar (c) sugar (d) time
  2. 2.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
  3. 3.⚖️ 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) True (b) False
  4. 4.⚖️ 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 change it (b) we measure it (c) we keep it the same
  5. 5.🔍 Which is the odd one out? (a) salt (b) sunlight (c) a magnet (d) time
  6. 6.🔍 Which is the odd one out? (a) warm water (b) salt (c) sunlight (d) vinegar
  7. 7.True or false: vinegar is something yeast needs. (a) False (b) True
  8. 8.True or false: sugar is needed for the yeast balloon. (a) False (b) True
  9. 9.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) a battery cell (d) a balloon
  10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) turmeric powder (d) sugar
  11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) warm water (d) a magnet
  12. 12.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
  13. 13.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
  14. 14.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold makes it pink (d) cold kills sugar
  15. 15.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) sunlight (d) a magnet
  16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
  17. 17.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) time (d) salt
  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 sugar”? (a) we change it (b) we measure it (c) we keep it the same
  19. 19.True or false: sunlight is something yeast needs. (a) False (b) True
  20. 20.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) steam (d) air from outside
  21. 21.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
  22. 22.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
  23. 23.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
  24. 24.⚖️ 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 same bottles
  25. 25.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it grows much faster (d) it bursts at once
  26. 26.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
  27. 27.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) the yeast is killed (d) it grows faster
  28. 28.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
  29. 29.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
  30. 30.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) sugar (d) time
  31. 31.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a balloon (d) a comb
  32. 32.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
  33. 33.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of salt (d) a kind of sugar
  34. 34.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
  35. 35.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
  36. 36.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to wash dishes (d) to colour rice
  37. 37.⚖️ 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 measure it (c) we change it
  38. 38.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) a small bottle (d) a mirror
  39. 39.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
  40. 40.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed

Answer key

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

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