Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 519 · 40 questions

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.

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

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