Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 391 · 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.🛟 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
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a paper clip (d) a balloon
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a comb (d) sugar
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) turmeric powder (c) a balloon (d) sugar
6. 6.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to wash dishes (d) to colour rice
7. 7.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
8. 8.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
10. 10.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.⚖️ 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) True (b) False
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) dry yeast (c) a balloon (d) warm water
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) smoke (d) air from outside
14. 14.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a balloon (c) a magnet (d) a paper clip
15. 15.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
16. 16.🔍 Which is the odd one out? (a) time (b) warm water (c) sunlight (d) sugar
17. 17.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) salt (d) time
18. 18.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) sunlight (d) warm water
20. 20.True or false: time is something yeast needs. (a) False (b) True
21. 21.⚖️ 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
22. 22.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
23. 23.⚖️ 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) size of the balloon (b) the water temperature (c) the same bottles (d) the amount of sugar
24. 24.⚖️ 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 change it (c) we measure it
25. 25.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
26. 26.⚖️ 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 keep it the same (b) we change it (c) we measure it
27. 27.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.⚖️ 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 change it (b) we measure it (c) we keep it the same
29. 29.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
30. 30.⚖️ 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) False (b) True
31. 31.⚖️ 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 keep it the same (c) we measure it
32. 32.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
33. 33.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
34. 34.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
35. 35.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a battery cell (c) a magnet (d) a small bottle
36. 36.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) time (d) vinegar
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
38. 38.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
39. 39.True or false: sugar is something yeast does not need. (a) True (b) False
40. 40.True or false: a comb is needed for the yeast balloon. (a) True (b) False

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