Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 572 · 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) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
2. 2.⚖️ 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 measure it (c) we keep it the same
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a battery cell (c) dry yeast (d) a balloon
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a battery cell (c) warm water (d) a small bottle
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) True (b) False
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a small bottle (c) a balloon (d) sugar
7. 7.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) salt (d) time
8. 8.⚖️ 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
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) True (b) False
10. 10.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) throw it at a wall (d) put it in your mouth
11. 11.⚖️ 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
12. 12.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
13. 13.🍞 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
14. 14.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) sugar (d) a paper clip
16. 16.⚖️ 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) False (b) True
17. 17.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a mirror (d) a balloon
19. 19.⚖️ 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 change it (b) we measure it (c) we keep it the same
20. 20.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows very little (d) it grows much faster
21. 21.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.⚖️ 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
23. 23.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
24. 24.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
25. 25.True or false: warm water is something yeast does not need. (a) True (b) False
26. 26.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
27. 27.True or false: vinegar is something yeast needs. (a) True (b) False
28. 28.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
29. 29.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) time (d) vinegar
30. 30.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
31. 31.🍞 Which of these is something yeast does not need? (a) sunlight (b) time (c) sugar (d) warm water
32. 32.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) turmeric powder (c) a paper clip (d) a comb
34. 34.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) sugar (d) time
35. 35.⚖️ 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) False (b) True
36. 36.⚖️ 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 sugar (b) the amount of yeast (c) size of the balloon (d) the amount of water
37. 37.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a magnet (c) a balloon (d) a small bottle
39. 39.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
40. 40.⚖️ 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

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