Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 698 · 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 wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) dry yeast (d) turmeric powder
3. 3.⚖️ 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) False (b) True
4. 4.🔍 Which is the odd one out? (a) salt (b) a magnet (c) time (d) vinegar
5. 5.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) vinegar (d) a magnet
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) turmeric powder (c) a small bottle (d) a magnet
7. 7.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) pour it down the sink (d) put it in your mouth
8. 8.⚖️ 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
9. 9.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) a magnet
10. 10.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) salt (d) vinegar
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) a balloon (d) turmeric powder
12. 12.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
13. 13.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) time (d) warm water
14. 14.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
15. 15.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it heavy (d) to make it sweet
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) warm water (d) a comb
17. 17.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
18. 18.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
20. 20.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
21. 21.⚖️ 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 yeast (b) the amount of water (c) the amount of sugar (d) size of the balloon
22. 22.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) sugar (d) sunlight
23. 23.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
24. 24.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
25. 25.⚖️ 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 same bottles (b) the water temperature (c) size of the balloon (d) the amount of water
26. 26.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) vinegar
27. 27.⚖️ 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 keep it the same (b) we measure it (c) we change it
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of sugar (b) the water temperature (c) size of the balloon
30. 30.⚖️ 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
31. 31.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it grows very little (d) it turns yellow
32. 32.True or false: sugar is needed for the yeast balloon. (a) False (b) True
33. 33.True or false: sugar is something yeast needs. (a) False (b) True
34. 34.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) sunlight (d) a magnet
35. 35.True or false: a magnet is something yeast does not need. (a) False (b) True
36. 36.True or false: a magnet is something yeast needs. (a) False (b) True
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) sugar (d) a magnet
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a battery cell (d) dry yeast
39. 39.⚖️ 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
40. 40.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed

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