Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 125 · 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? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the amount of sugar
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 sugar”? (a) we measure it (b) we keep it the same (c) we change it
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) sugar (c) dry yeast (d) a balloon
4. 4.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) salt
5. 5.True or false: a magnet is something yeast does not need. (a) False (b) True
6. 6.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) time (b) sunlight (c) salt (d) vinegar
8. 8.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
9. 9.⚖️ 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 change it (c) we keep it the same
10. 10.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
11. 11.True or false: a comb is needed for the yeast balloon. (a) False (b) True
12. 12.🔍 Which is the odd one out? (a) vinegar (b) salt (c) a magnet (d) sugar
13. 13.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) a balloon (d) warm water
15. 15.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a balloon (c) warm water (d) dry yeast
17. 17.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
19. 19.⚖️ 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) True (b) False
20. 20.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) steam (d) air from outside
21. 21.⚖️ 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 measure it (c) we change it
22. 22.🍞 Which of these is something yeast does not need? (a) salt (b) sugar (c) warm water (d) time
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) a paper clip (d) sugar
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) True (b) False
25. 25.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a kind of sugar (d) a tiny living fungus
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) dry yeast (d) a magnet
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a small bottle (d) turmeric powder
29. 29.🍞 Which of these is something yeast does not need? (a) a magnet (b) sugar (c) warm water (d) time
30. 30.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
31. 31.⚖️ 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 amount of sugar (c) the amount of water (d) size of the balloon
32. 32.True or false: salt is something yeast needs. (a) True (b) False
33. 33.True or false: vinegar is something yeast needs. (a) True (b) False
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) a comb (d) dry yeast
35. 35.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
36. 36.⚖️ 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
37. 37.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a magnet (c) a comb (d) a mirror
38. 38.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sunlight (d) sugar
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we change it (b) we measure it (c) we keep it the same

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