Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 750 · 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.⚖️ 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
2. 2.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.⚖️ 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 measure it (b) we change it (c) we keep it the same
4. 4.⚖️ 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 water (b) the amount of sugar (c) the water temperature (d) size of the balloon
5. 5.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
6. 6.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) sugar (d) time
7. 7.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
8. 8.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
9. 9.🛟 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
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) the water temperature (b) size of the balloon (c) the amount of yeast
11. 11.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to wash dishes (d) to colour rice
12. 12.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
14. 14.True or false: vinegar is something yeast needs. (a) True (b) False
15. 15.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a magnet (d) sugar
17. 17.True or false: time is something yeast does not need. (a) False (b) True
18. 18.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
19. 19.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) sugar (c) a battery cell (d) a magnet
20. 20.🔍 Which is the odd one out? (a) salt (b) time (c) sugar (d) warm water
21. 21.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.🍞 Which of these is something yeast needs? (a) time (b) sunlight (c) vinegar (d) a magnet
23. 23.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) warm water (d) vinegar
24. 24.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) turmeric powder (c) a comb (d) a small bottle
26. 26.⚖️ 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
27. 27.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) sunlight (d) warm water
28. 28.🍞 Which of these is something yeast does not need? (a) a magnet (b) sugar (c) warm water (d) time
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a mirror (d) warm water
30. 30.⚖️ 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
31. 31.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it turns yellow (d) it grows very little
32. 32.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.⚖️ 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 same bottles (c) the water temperature
34. 34.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.⚖️ 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) False (b) True
36. 36.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) sunlight (d) salt
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) the water temperature (b) the amount of sugar (c) size of the balloon
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) sugar (d) a comb
40. 40.True or false: sunlight is something yeast does not need. (a) False (b) True

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