Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 130 · 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 clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
2. 2.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) sugar (d) turmeric powder
4. 4.⚖️ 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
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) turmeric powder (d) dry yeast
6. 6.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) size of the balloon (c) the water temperature (d) the amount of yeast
8. 8.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
9. 9.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
10. 10.⚖️ 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 change it (c) we keep it the same
11. 11.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
12. 12.🔍 Which is the odd one out? (a) sugar (b) warm water (c) sunlight (d) time
13. 13.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
14. 14.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) a balloon (c) dry yeast (d) warm water
16. 16.🔍 Which is the odd one out? (a) vinegar (b) time (c) sunlight (d) salt
17. 17.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it grows very little (d) it bursts at once
18. 18.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
19. 19.⚖️ 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
20. 20.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) warm water (d) time
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) sugar (d) a comb
22. 22.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
23. 23.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
24. 24.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) sugar (d) salt
25. 25.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold water is heavy (d) cold slows yeast down
26. 26.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
27. 27.🔍 Which is the odd one out? (a) warm water (b) salt (c) sugar (d) time
28. 28.True or false: sunlight is something yeast needs. (a) False (b) True
29. 29.⚖️ 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) size of the balloon (b) the water temperature (c) the amount of water (d) the amount of sugar
30. 30.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
31. 31.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False
33. 33.⚖️ 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 change it (b) we measure it (c) we keep it the same
34. 34.True or false: sunlight is something yeast does not need. (a) True (b) False
35. 35.🧺 Do we need warm water 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? Which of these is kept the same? (a) the water temperature (b) size of the balloon (c) the amount of water
37. 37.True or false: a magnet is something yeast needs. (a) True (b) False
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a comb (c) sugar (d) a balloon
39. 39.⚖️ 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 amount of sugar (c) the water temperature
40. 40.⚖️ 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) False (b) True

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