Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 715 · 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: sugar is something yeast needs. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) a magnet (b) time (c) sunlight (d) vinegar
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) size of the balloon (b) the amount of yeast (c) the water temperature (d) the amount of water
4. 4.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to wash dishes (d) to clean floors
5. 5.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
6. 6.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) sunlight (d) a magnet
7. 7.🔍 Which is the odd one out? (a) sugar (b) salt (c) vinegar (d) a magnet
8. 8.True or false: salt is something yeast does not need. (a) False (b) True
9. 9.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
10. 10.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
11. 11.⚖️ 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
12. 12.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) time (d) warm water
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) warm water (d) sugar
14. 14.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) it shrinks to nothing (d) the balloon is smaller
15. 15.True or false: time is something yeast needs. (a) False (b) True
16. 16.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) salt (d) warm water
17. 17.⚖️ 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 change it (c) we measure it
18. 18.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) to make it sweet (d) it is food for yeast
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) True (b) False
21. 21.True or false: time is something yeast does not need. (a) True (b) False
22. 22.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) dry yeast (c) sugar (d) a balloon
23. 23.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) turmeric powder (d) a balloon
24. 24.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) warm water (d) a paper clip
26. 26.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
27. 27.⚖️ 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 amount of sugar (c) the water temperature (d) size of the balloon
28. 28.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) sunlight (d) a magnet
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 balloon (d) turmeric powder
30. 30.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) keep it for a month (d) throw it at a wall
31. 31.True or false: a magnet is something yeast does not need. (a) False (b) True
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 kept the same. (a) True (b) False
33. 33.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.🔍 Which is the odd one out? (a) salt (b) warm water (c) vinegar (d) a magnet
35. 35.True or false: salt is something yeast needs. (a) True (b) False
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) a comb (d) sugar
37. 37.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) turmeric powder (d) dry yeast
38. 38.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.🔮 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
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False

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