Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 232 · 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.🛟 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
2. 2.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
3. 3.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
4. 4.⚖️ 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) True (b) False
5. 5.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
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) size of the balloon (b) the amount of sugar (c) the water temperature (d) the amount of yeast
7. 7.🍞 Which of these is something yeast needs? (a) warm water (b) salt (c) sunlight (d) a magnet
8. 8.True or false: warm water is something yeast does not need. (a) False (b) True
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) turmeric powder (d) dry yeast
10. 10.⚖️ 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
11. 11.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
12. 12.⚖️ 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 keep it the same (c) we change it
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a balloon (c) sugar (d) warm water
14. 14.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
15. 15.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) warm water (d) vinegar
16. 16.⚖️ 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
17. 17.🍞 Which of these is something yeast needs? (a) a magnet (b) time (c) salt (d) sunlight
18. 18.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
19. 19.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
20. 20.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) it is food for yeast (d) to make it heavy
21. 21.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) it turns to bread (d) the balloon is bigger
22. 22.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) time (d) warm water
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) warm water (d) a paper clip
24. 24.🔍 Which is the odd one out? (a) warm water (b) time (c) sunlight (d) sugar
25. 25.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a battery cell (c) a magnet (d) sugar
27. 27.🔍 Which is the odd one out? (a) a magnet (b) salt (c) sunlight (d) time
28. 28.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) sugar (d) warm water
29. 29.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) False (b) True
31. 31.True or false: vinegar is something yeast does not need. (a) False (b) True
32. 32.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
33. 33.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
34. 34.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) sugar (d) a battery cell
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) True (b) False
37. 37.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) vinegar
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a mirror (c) turmeric powder (d) a magnet
39. 39.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a comb (c) dry yeast (d) sugar

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