Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 38 · 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.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) sugar (c) dry yeast (d) a small bottle
2. 2.True or false: vinegar is something yeast needs. (a) True (b) False
3. 3.⚖️ 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 yeast (d) size of the balloon
4. 4.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
5. 5.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
6. 6.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) vinegar (d) time
7. 7.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.🔍 Which is the odd one out? (a) sugar (b) salt (c) a magnet (d) vinegar
9. 9.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
10. 10.⚖️ 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 amount of yeast (c) the water temperature
11. 11.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
12. 12.⚖️ 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
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) size of the balloon (b) the amount of water (c) the water temperature
14. 14.True or false: a comb is needed for the yeast balloon. (a) True (b) False
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) a mirror (d) a balloon
16. 16.⚖️ 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 keep it the same (b) we measure it (c) we change it
17. 17.🛟 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
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) sugar (d) a comb
19. 19.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.True or false: sugar is something yeast does not need. (a) True (b) False
21. 21.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to colour rice (d) to wash dishes
22. 22.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold slows yeast down (d) cold makes it pink
23. 23.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) time (d) warm water
24. 24.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
25. 25.True or false: warm water is something yeast needs. (a) True (b) False
26. 26.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.True or false: sunlight is something yeast needs. (a) True (b) False
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? True or false: size of the balloon is what we measure. (a) True (b) False
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) sugar (c) turmeric powder (d) a magnet
31. 31.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
32. 32.🔍 Which is the odd one out? (a) time (b) sugar (c) vinegar (d) warm water
33. 33.🍞 Which of these is something yeast does not need? (a) sunlight (b) warm water (c) sugar (d) time
34. 34.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) to colour it (d) it is food for yeast
35. 35.⚖️ 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) False (b) True
36. 36.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
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 measure it (b) we change it (c) we keep it the same
38. 38.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
39. 39.🔮 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
40. 40.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it

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