Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 392 · 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.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
2. 2.⚖️ 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 change it (c) we keep it the same
3. 3.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
4. 4.⚖️ 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 change it (b) we keep it the same (c) we measure it
5. 5.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) sunlight
6. 6.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it heavy (d) to make it sweet
7. 7.⚖️ 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 keep it the same (c) we change it
8. 8.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) dry yeast (d) a battery cell
9. 9.⚖️ 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
10. 10.⚖️ 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 amount of sugar (b) the amount of water (c) the water temperature (d) size of the balloon
11. 11.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) a magnet (d) time
12. 12.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
13. 13.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it turns yellow (d) it bursts at once
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a paper clip (c) a small bottle (d) warm water
15. 15.⚖️ 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 yeast (b) the water temperature (c) size of the balloon
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) dry yeast (d) a magnet
17. 17.True or false: a comb is needed for the yeast balloon. (a) True (b) False
18. 18.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) warm water (c) sugar (d) dry yeast
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a battery cell (c) a balloon (d) a mirror
21. 21.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
22. 22.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) sunlight (d) a magnet
23. 23.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.⚖️ 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
25. 25.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) a magnet
26. 26.True or false: salt is something yeast does not need. (a) True (b) False
27. 27.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to make bread rise (d) to wash dishes
28. 28.🔍 Which is the odd one out? (a) vinegar (b) time (c) sunlight (d) salt
29. 29.⚖️ 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
30. 30.True or false: warm water is something yeast needs. (a) True (b) False
31. 31.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
32. 32.True or false: time is something yeast does not need. (a) True (b) False
33. 33.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) a comb (d) sugar
35. 35.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) sunlight (d) vinegar
36. 36.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) it shrinks to nothing (d) the balloon is bigger
37. 37.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
38. 38.⚖️ 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 yeast (b) size of the balloon (c) the amount of sugar (d) the water temperature
39. 39.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) a magnet (d) time
40. 40.🔮 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

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