Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 117 · 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.⚖️ 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) False (b) True
2. 2.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a mirror (c) warm water (d) a balloon
4. 4.⚖️ 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
5. 5.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
6. 6.True or false: salt is something yeast needs. (a) False (b) True
7. 7.⚖️ 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
8. 8.True or false: warm water is something yeast does not need. (a) False (b) True
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the same bottles
10. 10.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) salt (d) vinegar
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) throw it at a wall (d) keep it for a month
12. 12.🔍 Which is the odd one out? (a) sugar (b) time (c) sunlight (d) warm water
13. 13.True or false: sunlight is something yeast does not need. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) salt (b) sugar (c) time (d) warm water
15. 15.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) salt
16. 16.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) True (b) False
18. 18.⚖️ 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 yeast (b) the same bottles (c) the amount of sugar (d) size of the balloon
19. 19.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a paper clip (d) a balloon
21. 21.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
22. 22.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold kills sugar (d) cold slows yeast down
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a magnet (c) warm water (d) a small bottle
24. 24.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it turns yellow (d) it grows much faster
25. 25.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
26. 26.⚖️ 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
27. 27.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) a magnet (d) sugar
28. 28.⚖️ 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) True (b) False
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) warm water (d) a comb
30. 30.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) salt (d) warm water
31. 31.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing
32. 32.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a magnet (c) a mirror (d) a battery cell
33. 33.True or false: vinegar is something yeast needs. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) vinegar
35. 35.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) sunlight
36. 36.🍞 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
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? What do we do with “the amount of yeast”? (a) we change it (b) we measure it (c) we keep it the same
39. 39.⚖️ 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
40. 40.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to clean floors (d) to colour rice

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