Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 670 · 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? What do we do with “the amount of yeast”? (a) we change it (b) we measure it (c) we keep it the same
2. 2.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) warm water (c) a comb (d) a magnet
4. 4.🔍 Which is the odd one out? (a) sunlight (b) salt (c) vinegar (d) time
5. 5.⚖️ 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 measure it (b) we change it (c) we keep it the same
6. 6.True or false: warm water is needed for the yeast balloon. (a) False (b) True
7. 7.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
8. 8.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) the yeast is killed (d) it grows faster
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a magnet (c) sugar (d) a small bottle
10. 10.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it turns yellow (d) it bursts at once
11. 11.⚖️ 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
12. 12.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.⚖️ 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) True (b) False
14. 14.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
15. 15.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
16. 16.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sugar (d) sunlight
17. 17.⚖️ 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) the water temperature (c) size of the balloon
18. 18.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.🔍 Which is the odd one out? (a) a magnet (b) sugar (c) salt (d) sunlight
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a mirror (c) a balloon (d) dry yeast
21. 21.True or false: sunlight is something yeast needs. (a) False (b) True
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a small bottle (d) a battery cell
23. 23.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) turmeric powder (c) a small bottle (d) a balloon
25. 25.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
26. 26.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) warm water (d) sunlight
27. 27.True or false: sugar is something yeast does not need. (a) True (b) False
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) sugar (d) time
30. 30.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) True (b) False
32. 32.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
33. 33.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
34. 34.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a magnet (c) a mirror (d) turmeric powder
35. 35.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
36. 36.True or false: sunlight is something yeast does not need. (a) False (b) True
37. 37.⚖️ 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 keep it the same (b) we measure it (c) we change it
38. 38.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.True or false: vinegar is something yeast needs. (a) True (b) False
40. 40.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False

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