Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 480 · 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.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
2. 2.⚖️ 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 measure it (b) we keep it the same (c) we change it
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) True (b) False
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) warm water (d) a battery cell
5. 5.True or false: time is something yeast needs. (a) True (b) False
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 what we measure. (a) False (b) True
7. 7.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
8. 8.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
9. 9.⚖️ 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 change it (c) we keep it the same
10. 10.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) a magnet (d) dry yeast
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) sugar (c) a magnet (d) a mirror
13. 13.⚖️ 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
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a small bottle (d) a paper clip
15. 15.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
16. 16.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) vinegar (d) salt
17. 17.🔮 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
18. 18.True or false: vinegar is something yeast needs. (a) True (b) False
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a balloon (c) warm water (d) sugar
20. 20.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.⚖️ 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
22. 22.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a comb (c) turmeric powder (d) a magnet
23. 23.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
24. 24.⚖️ 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
25. 25.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) throw it at a wall (d) pour it down the sink
26. 26.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
27. 27.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a balloon (c) a battery cell (d) a mirror
28. 28.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
29. 29.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
30. 30.🍞 Which of these is something yeast does not need? (a) vinegar (b) warm water (c) time (d) sugar
31. 31.⚖️ 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 same bottles (b) size of the balloon (c) the water temperature (d) the amount of yeast
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
33. 33.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to clean floors (d) to wash dishes
34. 34.True or false: warm water is something yeast needs. (a) True (b) False
35. 35.True or false: a comb is needed for the yeast balloon. (a) True (b) False
36. 36.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
37. 37.True or false: vinegar is something yeast does not need. (a) True (b) False
38. 38.True or false: salt is something yeast does not need. (a) False (b) True
39. 39.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
40. 40.⚖️ 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 water (b) the same bottles (c) the amount of sugar (d) size of the balloon

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