Yeast Balloon Experiment Worksheet

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

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