Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 265 · 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.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
2. 2.⚖️ 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
3. 3.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
4. 4.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
5. 5.⚖️ 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 change it (c) we keep it the same
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a magnet (d) a small bottle
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) a balloon (d) a comb
8. 8.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) sunlight (d) sugar
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) a small bottle (d) warm water
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) the amount of sugar (b) size of the balloon (c) the water temperature
11. 11.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
12. 12.🍞 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
13. 13.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
14. 14.True or false: salt is something yeast needs. (a) False (b) True
15. 15.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
16. 16.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.🍞 Which of these is something yeast does not need? (a) time (b) vinegar (c) warm water (d) sugar
18. 18.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
19. 19.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) salt (d) warm water
21. 21.⚖️ 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 water (c) the water temperature (d) the same bottles
22. 22.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
23. 23.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
24. 24.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
25. 25.🔍 Which is the odd one out? (a) salt (b) time (c) vinegar (d) a magnet
26. 26.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) size of the balloon (c) the water temperature
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 keep it the same (b) we measure it (c) we change it
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a magnet (d) a small bottle
30. 30.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
31. 31.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.True or false: vinegar is something yeast needs. (a) False (b) True
33. 33.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a mirror (c) a comb (d) sugar
34. 34.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to clean floors (d) to colour rice
35. 35.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) sugar (d) vinegar
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) sugar (c) dry yeast (d) warm water
37. 37.🔍 Which is the odd one out? (a) sugar (b) warm water (c) salt (d) time
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) a small bottle (d) a battery cell
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) sugar (d) warm water
40. 40.True or false: warm water is something yeast does not need. (a) True (b) False

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