Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 583 · 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? True or false: size of the balloon is the one thing we change. (a) False (b) True
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a paper clip (c) warm water (d) a balloon
3. 3.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a tiny living fungus (d) a kind of salt
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) a paper clip (d) a balloon
5. 5.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a battery cell (c) a magnet (d) warm water
7. 7.True or false: vinegar is something yeast does not need. (a) True (b) False
8. 8.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) time (d) salt
9. 9.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
10. 10.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) the balloon is smaller (d) it shrinks to nothing
11. 11.⚖️ 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
12. 12.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
13. 13.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) turmeric powder (c) a small bottle (d) a paper clip
14. 14.True or false: sunlight is something yeast does not need. (a) True (b) False
15. 15.⚖️ 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) True (b) False
16. 16.⚖️ 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 same bottles (d) the amount of sugar
17. 17.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
18. 18.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
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 keep it the same (b) we change it (c) we measure it
20. 20.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold kills sugar (c) cold water is heavy (d) cold makes it pink
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a balloon (c) sugar (d) a comb
22. 22.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
23. 23.True or false: time is something yeast does not need. (a) False (b) True
24. 24.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
25. 25.⚖️ 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 water (b) the water temperature (c) size of the balloon
26. 26.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) turmeric powder (d) a small bottle
28. 28.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) to colour it (d) it is food for yeast
29. 29.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
30. 30.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
31. 31.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
32. 32.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) salt
33. 33.⚖️ 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 sugar
34. 34.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a mirror (c) a paper clip (d) turmeric powder
35. 35.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) carbon dioxide gas (d) air from outside
36. 36.🔍 Which is the odd one out? (a) sunlight (b) salt (c) sugar (d) vinegar
37. 37.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to clean floors (d) to make bread rise
38. 38.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) a magnet (d) sunlight
39. 39.🧺 Do we need dry yeast 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) sugar (b) warm water (c) a small bottle (d) a comb

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