Yeast Balloon Experiment Worksheet

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

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