Yeast Balloon Experiment Worksheet

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

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