Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 821 · 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.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to wash dishes (d) to colour rice
2. 2.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) a magnet
4. 4.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a balloon (d) a mirror
6. 6.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
7. 7.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) salt (d) warm water
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) dry yeast (d) a magnet
9. 9.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) sunlight
10. 10.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
11. 11.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.⚖️ 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 keep it the same (c) we change it
14. 14.True or false: salt is something yeast needs. (a) False (b) True
15. 15.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
16. 16.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it grows much faster (d) it bursts at once
17. 17.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
18. 18.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it turns to sugar (d) it grows faster
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False
20. 20.True or false: time is something yeast needs. (a) True (b) False
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 sugar”? (a) we change it (b) we keep it the same (c) we measure it
22. 22.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) salt (d) sugar
23. 23.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) steam (d) carbon dioxide gas
24. 24.⚖️ 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 measure it (b) we keep it the same (c) we change it
25. 25.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
26. 26.⚖️ 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 keep it the same (b) we measure it (c) we change it
27. 27.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
28. 28.⚖️ 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
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
30. 30.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
31. 31.⚖️ 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
32. 32.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a tiny living fungus (d) a kind of salt
33. 33.True or false: warm water is something yeast needs. (a) False (b) True
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) warm water (d) a comb
35. 35.⚖️ 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
36. 36.⚖️ 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
37. 37.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) dry yeast (c) turmeric powder (d) a magnet
39. 39.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a balloon (d) a paper clip

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