Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 111 · 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.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
2. 2.⚖️ 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
3. 3.🔍 Which is the odd one out? (a) vinegar (b) time (c) salt (d) sunlight
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) dry yeast (d) a battery cell
5. 5.⚖️ 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 measure it (b) we change it (c) we keep it the same
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) sugar (d) turmeric powder
7. 7.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
8. 8.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
9. 9.⚖️ 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 change it (b) we measure it (c) we keep it the same
10. 10.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) salt (d) a magnet
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) warm water (c) a comb (d) turmeric powder
12. 12.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
13. 13.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) sunlight
14. 14.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
15. 15.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) salt (d) sugar
16. 16.🍞 Which of these is something yeast needs? (a) time (b) vinegar (c) salt (d) a magnet
17. 17.True or false: a comb is 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) a balloon (c) dry yeast (d) a mirror
19. 19.⚖️ 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 water (b) the amount of yeast (c) the water temperature (d) size of the balloon
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a small bottle (c) a battery cell (d) a mirror
21. 21.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
22. 22.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a magnet (d) sugar
24. 24.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) warm water (d) a magnet
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) dry yeast (d) a mirror
27. 27.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.⚖️ 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) size of the balloon (c) the water temperature
29. 29.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
30. 30.⚖️ 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 measure it (c) we keep it the same
31. 31.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) it is food for yeast (d) to make it sweet
32. 32.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) boiling hot (d) very salty
33. 33.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
34. 34.⚖️ 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) True (b) False
35. 35.True or false: sugar is something yeast does not need. (a) True (b) False
36. 36.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
37. 37.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
38. 38.⚖️ 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 water temperature (b) the amount of yeast (c) the same bottles (d) the amount of water
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a balloon (c) a small bottle (d) dry yeast
40. 40.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True

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