Yeast Balloon Experiment Worksheet

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

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