Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 895 · 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: time is something yeast needs. (a) False (b) True
2. 2.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) it turns to bread (d) the balloon is smaller
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a magnet (c) sugar (d) dry yeast
4. 4.⚖️ 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 keep it the same (b) we change it (c) we measure it
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) the water temperature (c) size of the balloon
6. 6.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) salt
7. 7.True or false: a comb is needed for the yeast balloon. (a) True (b) False
8. 8.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) sugar (d) sunlight
9. 9.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) sunlight
10. 10.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a battery cell (c) turmeric powder (d) a magnet
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) keep it for a month (d) put it in your mouth
13. 13.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a mirror (c) a magnet (d) warm water
14. 14.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to make it heavy (d) to colour it
15. 15.⚖️ 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) False (b) True
16. 16.🍞 Which of these is something yeast needs? (a) time (b) salt (c) vinegar (d) sunlight
17. 17.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) warm water (c) a balloon (d) dry yeast
19. 19.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
20. 20.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
22. 22.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) True (b) False
25. 25.⚖️ 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 sugar (d) the amount of yeast
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) False (b) True
27. 27.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
28. 28.⚖️ 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
29. 29.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to clean floors (d) to colour rice
30. 30.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it glows (d) it grows faster
31. 31.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
32. 32.⚖️ 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 amount of water (c) the amount of sugar (d) the water temperature
33. 33.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.⚖️ 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 measure it (b) we change it (c) we keep it the same
35. 35.🔮 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
36. 36.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
37. 37.⚖️ 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) size of the balloon (c) the water temperature
38. 38.⚖️ 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 amount of yeast
39. 39.⚖️ 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
40. 40.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) warm water (c) sugar (d) dry yeast

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