Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 490 · 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 battery cell for the yeast balloon? (a) not needed (b) needed
2. 2.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.⚖️ 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
4. 4.⚖️ 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) False (b) True
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) False (b) True
6. 6.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
7. 7.⚖️ 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
8. 8.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) vinegar
9. 9.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
10. 10.True or false: sunlight is something yeast does not need. (a) False (b) True
11. 11.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold kills sugar (d) cold water is heavy
13. 13.True or false: sunlight is something yeast needs. (a) False (b) True
14. 14.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) a magnet (d) sugar
15. 15.🛟 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
16. 16.⚖️ 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 same bottles (b) the amount of sugar (c) the water temperature (d) size of the balloon
17. 17.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a balloon (c) a mirror (d) a paper clip
18. 18.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
19. 19.⚖️ 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 measure it (b) we change it (c) we keep it the same
20. 20.⚖️ 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 change it (c) we measure it
21. 21.🔮 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
22. 22.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) the balloon is smaller (d) it shrinks to nothing
23. 23.⚖️ 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 change it (b) we measure it (c) we keep it the same
24. 24.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a balloon (d) turmeric powder
26. 26.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) salt (d) warm water
27. 27.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to clean floors (d) to wash dishes
28. 28.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) vinegar
29. 29.True or false: time is something yeast needs. (a) False (b) True
30. 30.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
31. 31.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) sugar (d) vinegar
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) a magnet (d) sugar
33. 33.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a comb (d) sugar
35. 35.⚖️ 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
36. 36.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) sugar (c) warm water (d) dry yeast
38. 38.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
39. 39.🔍 Which is the odd one out? (a) sunlight (b) salt (c) time (d) vinegar
40. 40.True or false: salt is something yeast does not need. (a) False (b) True

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