Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 297 · 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.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
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 keep it the same (c) we change it
3. 3.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) a magnet (d) sugar
5. 5.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
6. 6.⚖️ 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
7. 7.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) vinegar
8. 8.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) turmeric powder (d) warm water
10. 10.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
11. 11.🔍 Which is the odd one out? (a) time (b) a magnet (c) salt (d) sunlight
12. 12.⚖️ 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 keep it the same (b) we measure it (c) we change it
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) sugar (d) a magnet
14. 14.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) sunlight (d) warm water
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) dry yeast (c) a balloon (d) sugar
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) the water temperature (b) the same bottles (c) the amount of sugar (d) the amount of water
17. 17.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
19. 19.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
20. 20.⚖️ 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) False (b) True
21. 21.True or false: warm water is something yeast does not need. (a) False (b) True
22. 22.⚖️ 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) False (b) True
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a balloon (d) a comb
24. 24.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) salt (d) sugar
25. 25.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
26. 26.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it shrinks to nothing (d) it turns to bread
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) a small bottle (d) a balloon
28. 28.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
29. 29.True or false: a comb is needed for the yeast balloon. (a) True (b) False
30. 30.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
31. 31.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to make bread rise (d) to clean floors
32. 32.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
33. 33.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it grows faster (d) it turns to sugar
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the same bottles (c) the amount of yeast (d) the water temperature
35. 35.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) dry yeast (c) a battery cell (d) a magnet
36. 36.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold water is heavy (d) cold makes it pink
37. 37.⚖️ 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
38. 38.⚖️ 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) False (b) True
39. 39.⚖️ 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
40. 40.⚖️ 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

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