Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 638 · 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: turmeric powder is not needed for the yeast balloon. (a) True (b) False
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False
3. 3.⚖️ 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) True (b) False
4. 4.True or false: time is something yeast does not need. (a) True (b) False
5. 5.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
6. 6.⚖️ 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 same bottles (c) the water temperature (d) the amount of water
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a comb (d) a balloon
8. 8.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
9. 9.⚖️ 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 change it (b) we keep it the same (c) we measure it
10. 10.True or false: sunlight is something yeast does not need. (a) True (b) False
11. 11.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
12. 12.True or false: sugar is something yeast needs. (a) False (b) True
13. 13.⚖️ 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
14. 14.True or false: sunlight is something yeast needs. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) sugar (b) salt (c) sunlight (d) vinegar
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 measure it (b) we keep it the same (c) we change it
17. 17.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) salt (d) a magnet
18. 18.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) the balloon is bigger (d) it shrinks to nothing
19. 19.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
20. 20.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) True (b) False
22. 22.⚖️ 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 water temperature (d) the amount of sugar
23. 23.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) turmeric powder (c) a mirror (d) a small bottle
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a paper clip (d) a balloon
25. 25.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
26. 26.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to colour it (d) to make it sweet
27. 27.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
28. 28.🍞 Which of these is something yeast needs? (a) salt (b) time (c) a magnet (d) sunlight
29. 29.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
30. 30.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) a balloon (c) sugar (d) dry yeast
32. 32.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) smoke (d) air from outside
33. 33.True or false: a magnet is something yeast does not need. (a) False (b) True
34. 34.⚖️ 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
35. 35.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a battery cell (d) sugar
37. 37.⚖️ 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
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a balloon (c) a magnet (d) turmeric powder
39. 39.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) time (d) sugar
40. 40.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) salt

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