Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 758 · 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 a magnet to make gas? (a) yeast needs it (b) yeast does not need it
2. 2.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold makes it pink (d) cold water is heavy
3. 3.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of sugar (c) the amount of yeast (d) the water temperature
5. 5.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) a balloon (d) a battery cell
7. 7.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to wash dishes (d) to make bread rise
8. 8.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
9. 9.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a magnet (c) a comb (d) a paper clip
10. 10.⚖️ 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
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a magnet (d) sugar
12. 12.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
13. 13.🔍 Which is the odd one out? (a) salt (b) time (c) sunlight (d) a magnet
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) dry yeast (c) a balloon (d) a small bottle
15. 15.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) to make it heavy (d) it is food for yeast
16. 16.⚖️ 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 water (b) the water temperature (c) size of the balloon
17. 17.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) a magnet (d) warm water
18. 18.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
19. 19.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) time (d) sugar
20. 20.🛟 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
21. 21.True or false: vinegar is something yeast does not need. (a) False (b) True
22. 22.⚖️ 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 yeast (b) the water temperature (c) size of the balloon
23. 23.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
24. 24.🍞 Which of these is something yeast needs? (a) time (b) sunlight (c) salt (d) a magnet
25. 25.⚖️ 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
26. 26.🧺 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) a balloon
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) turmeric powder (d) sugar
28. 28.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) sugar (d) a magnet
29. 29.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) it turns to bread (d) the balloon is smaller
30. 30.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
31. 31.True or false: sunlight is something yeast needs. (a) True (b) False
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
33. 33.⚖️ 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
34. 34.⚖️ 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 keep it the same (c) we change it
35. 35.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
36. 36.⚖️ 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
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) sugar (d) a comb
38. 38.⚖️ 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 same bottles (c) size of the balloon
39. 39.True or false: sugar is something yeast needs. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) warm water (d) salt

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