Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 781 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) sugar (d) warm water
2. 2.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
3. 3.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a paper clip (c) turmeric powder (d) a battery cell
4. 4.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) a magnet (d) a small bottle
6. 6.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) True (b) False
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 yeast”? (a) we change it (b) we measure it (c) we keep it the same
8. 8.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) turmeric powder (c) a paper clip (d) a battery cell
10. 10.🔮 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
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) keep it for a month (d) put it in your mouth
12. 12.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) sugar (d) warm water
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a battery cell (d) dry yeast
16. 16.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
18. 18.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
19. 19.⚖️ 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 water temperature (b) size of the balloon (c) the same bottles (d) the amount of sugar
20. 20.⚖️ 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 keep it the same (b) we measure it (c) we change it
21. 21.⚖️ 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 keep it the same (c) we measure it
22. 22.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to wash dishes (d) to make bread rise
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) a balloon (d) dry yeast
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) warm water (c) a small bottle (d) dry yeast
25. 25.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
26. 26.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) salt
27. 27.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it grows much faster (d) it turns yellow
28. 28.True or false: time is something yeast needs. (a) False (b) True
29. 29.⚖️ 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 measure it (b) we keep it the same (c) we change it
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) turmeric powder (d) sugar
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
32. 32.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
33. 33.⚖️ 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 measure it (c) we change it
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) size of the balloon (b) the amount of water (c) the amount of yeast (d) the amount of sugar
35. 35.True or false: a comb is needed for the yeast balloon. (a) False (b) True
36. 36.True or false: warm water is something yeast does not need. (a) False (b) True
37. 37.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
38. 38.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) time (d) sugar
39. 39.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
40. 40.🔮 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

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