Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 400 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) dry yeast (d) turmeric powder
2. 2.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) salt (d) sunlight
3. 3.⚖️ 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 keep it the same (c) we measure it
4. 4.True or false: sunlight is something yeast does not need. (a) False (b) True
5. 5.⚖️ 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
6. 6.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) keep it for a month (d) throw it at a wall
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) sugar (c) a balloon (d) a small bottle
8. 8.⚖️ 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 amount of sugar (b) the amount of water (c) the same bottles (d) the water temperature
9. 9.True or false: salt is something yeast does not need. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) sunlight (b) salt (c) vinegar (d) sugar
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a magnet (d) a balloon
12. 12.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
13. 13.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
14. 14.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) a paper clip (d) sugar
16. 16.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) sunlight
17. 17.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
18. 18.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
19. 19.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
20. 20.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
21. 21.🔮 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
22. 22.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a magnet (c) sugar (d) a paper clip
23. 23.⚖️ 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
24. 24.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.⚖️ 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) False (b) True
27. 27.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
28. 28.⚖️ 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 keep it the same (c) we measure it
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) sugar (d) a paper clip
30. 30.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a small bottle (d) a comb
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a comb (c) a small bottle (d) dry yeast
33. 33.🔮 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
34. 34.True or false: sugar is something yeast does not need. (a) True (b) False
35. 35.🧺 Do we need a balloon 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? True or false: the same bottles is what we measure. (a) False (b) True
37. 37.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) salt (d) sugar
38. 38.True or false: vinegar is something yeast needs. (a) True (b) False
39. 39.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a battery cell (d) dry yeast
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 sugar”? (a) we keep it the same (b) we change it (c) we measure it

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