Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 76 · 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.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it heavy (d) to make it sweet
2. 2.⚖️ 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 yeast
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) warm water (d) turmeric powder
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a mirror (c) warm water (d) a balloon
5. 5.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) the balloon is bigger (d) it turns to bread
6. 6.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
7. 7.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) salt (d) warm water
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a balloon (d) turmeric powder
9. 9.⚖️ 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 measure it (b) we change it (c) we keep it the same
10. 10.True or false: sugar is something yeast does not need. (a) False (b) True
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) True (b) False
12. 12.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
14. 14.True or false: warm water is something yeast does not need. (a) False (b) True
15. 15.⚖️ 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
16. 16.True or false: a magnet is something yeast needs. (a) False (b) True
17. 17.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.⚖️ 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 measure it (b) we keep it the same (c) we change it
19. 19.🔍 Which is the odd one out? (a) sugar (b) time (c) salt (d) warm water
20. 20.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
22. 22.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
23. 23.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) throw it at a wall (d) keep it for a month
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) dry yeast (c) a battery cell (d) turmeric powder
25. 25.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
26. 26.⚖️ 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) True (b) False
27. 27.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) salt (d) vinegar
28. 28.🍞 Which of these is something yeast does not need? (a) sunlight (b) sugar (c) time (d) warm water
29. 29.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to make bread rise (d) to colour rice
30. 30.🔍 Which is the odd one out? (a) sunlight (b) time (c) warm water (d) sugar
31. 31.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) time (d) sugar
32. 32.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.True or false: a magnet is something yeast does not need. (a) False (b) True
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) dry yeast (d) a magnet
35. 35.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) warm water (c) turmeric powder (d) a magnet
36. 36.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
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 sugar”? (a) we measure it (b) we change it (c) we keep it the same
38. 38.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) a small bottle (d) sugar
40. 40.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it

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