Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 3 · 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.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
2. 2.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
3. 3.🍞 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
4. 4.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the amount of yeast (c) size of the balloon
6. 6.⚖️ 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
7. 7.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
8. 8.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sunlight (d) time
9. 9.⚖️ 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
10. 10.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it glows (d) it turns to sugar
11. 11.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) warm water (d) sunlight
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we keep it the same (b) we measure it (c) we change it
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a balloon (d) a magnet
16. 16.⚖️ 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) True (b) False
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a mirror (d) dry yeast
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a balloon (d) a paper clip
20. 20.True or false: warm water is something yeast does not need. (a) True (b) False
21. 21.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
22. 22.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) it turns to bread (d) the balloon is smaller
23. 23.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
24. 24.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) time (d) vinegar
25. 25.True or false: salt is something yeast does not need. (a) False (b) True
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) warm water (c) sugar (d) a balloon
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.🔍 Which is the odd one out? (a) salt (b) sunlight (c) a magnet (d) sugar
29. 29.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
30. 30.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) vinegar
31. 31.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
32. 32.⚖️ 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 yeast (b) size of the balloon (c) the amount of sugar (d) the water temperature
33. 33.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a comb (c) dry yeast (d) a paper clip
34. 34.True or false: warm water is something yeast needs. (a) False (b) True
35. 35.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) salt
36. 36.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the amount of sugar (c) size of the balloon
38. 38.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
39. 39.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
40. 40.🔮 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

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