Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 681 · 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.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) a mirror (d) sugar
3. 3.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) throw it at a wall (d) pour it down the sink
4. 4.⚖️ 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 amount of sugar (c) the water temperature
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a mirror (d) warm water
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) sugar (c) a small bottle (d) warm water
7. 7.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
8. 8.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) warm water (d) vinegar
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) size of the balloon (b) the amount of yeast (c) the water temperature
11. 11.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.🍞 Which of these is something yeast does not need? (a) sunlight (b) warm water (c) sugar (d) time
13. 13.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
14. 14.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) True (b) False
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a battery cell (d) dry yeast
18. 18.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
19. 19.🍞 Which of these is something yeast needs? (a) salt (b) sugar (c) a magnet (d) vinegar
20. 20.⚖️ 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) size of the balloon (c) the amount of water
21. 21.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
22. 22.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) dry yeast (d) a paper clip
24. 24.⚖️ 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
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) sugar (c) a small bottle (d) dry yeast
26. 26.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
27. 27.⚖️ 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 keep it the same (b) we change it (c) we measure it
28. 28.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
29. 29.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to make it sweet (d) to colour it
30. 30.⚖️ 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) False (b) True
31. 31.⚖️ 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) size of the balloon (c) the same bottles
32. 32.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows very little (d) it grows much faster
33. 33.True or false: warm water is something yeast does not need. (a) False (b) True
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
35. 35.⚖️ 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
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a balloon (c) turmeric powder (d) a comb
37. 37.⚖️ 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
38. 38.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) time (d) vinegar
39. 39.⚖️ 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 keep it the same (c) we change it
40. 40.⚖️ 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 keep it the same (c) we measure it

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