Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 230 · 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.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the same bottles
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) dry yeast (c) a balloon (d) sugar
3. 3.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
4. 4.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
5. 5.⚖️ 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
6. 6.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it bursts at once (d) it grows much faster
7. 7.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it heavy (d) to make it sweet
8. 8.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) salt (d) time
9. 9.True or false: salt is something yeast needs. (a) False (b) True
10. 10.True or false: time is something yeast needs. (a) True (b) False
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a battery cell (d) warm water
12. 12.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to colour rice (d) to clean floors
13. 13.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
14. 14.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold makes it pink (d) cold kills sugar
15. 15.⚖️ 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
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a paper clip (c) sugar (d) dry yeast
17. 17.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) dry yeast (d) a mirror
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a magnet (d) warm water
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) True (b) False
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.⚖️ 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 sugar (b) the amount of water (c) the amount of yeast (d) the water temperature
22. 22.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
23. 23.🔮 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
24. 24.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) air from outside (d) steam
25. 25.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) warm water (d) sunlight
26. 26.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
27. 27.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
28. 28.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
30. 30.True or false: warm water is something yeast needs. (a) False (b) True
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a small bottle (d) a battery cell
32. 32.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
33. 33.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
34. 34.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
35. 35.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we change it (b) we keep it the same (c) we measure it
37. 37.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) sugar (d) time
38. 38.True or false: vinegar is something yeast needs. (a) True (b) False
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we change it (b) we keep it the same (c) we measure it
40. 40.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False

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