Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 560 · 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.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) warm water (d) a paper clip
3. 3.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
4. 4.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.⚖️ 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
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a magnet (d) dry yeast
7. 7.⚖️ 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
8. 8.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
9. 9.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) warm water (d) vinegar
10. 10.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to make bread rise (d) to clean floors
11. 11.⚖️ 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) size of the balloon (c) the amount of yeast
12. 12.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of sugar (b) the water temperature (c) size of the balloon
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the amount of yeast (c) the water temperature (d) size of the balloon
15. 15.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold kills sugar (c) cold water is heavy (d) cold makes it pink
16. 16.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) vinegar (d) warm water
17. 17.🔍 Which is the odd one out? (a) warm water (b) sugar (c) sunlight (d) time
18. 18.🍞 Which of these is something yeast needs? (a) time (b) a magnet (c) salt (d) vinegar
19. 19.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) the balloon is bigger (d) it turns to bread
20. 20.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it grows very little (d) it turns yellow
21. 21.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
22. 22.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) a small bottle (d) sugar
24. 24.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) sugar (c) turmeric powder (d) a paper clip
26. 26.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) a magnet (d) a battery cell
27. 27.⚖️ 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 yeast (b) the water temperature (c) the amount of water (d) the amount of sugar
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) turmeric powder (d) warm water
29. 29.⚖️ 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 measure it (b) we keep it the same (c) we change it
30. 30.⚖️ 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) size of the balloon (c) the same bottles
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) False (b) True
32. 32.True or false: sunlight is something yeast does not need. (a) False (b) True
33. 33.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) a comb (d) sugar
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a comb (c) a small bottle (d) dry yeast
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a battery cell (c) a balloon (d) turmeric powder
37. 37.⚖️ 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 keep it the same (c) we measure it
38. 38.🍞 Which of these is something yeast does not need? (a) vinegar (b) sugar (c) warm water (d) time
39. 39.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
40. 40.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) throw it at a wall (d) keep it for a month

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