Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 731 · 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? Which of these is the one thing we change? (a) the water temperature (b) the amount of water (c) size of the balloon (d) the same bottles
2. 2.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) the balloon is smaller (d) it shrinks to nothing
3. 3.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
4. 4.⚖️ 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 same bottles (c) the water temperature
5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it turns yellow (d) it bursts at once
6. 6.⚖️ 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
7. 7.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
8. 8.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
9. 9.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
10. 10.True or false: sugar is something yeast does not need. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) warm water (d) time
12. 12.⚖️ 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
13. 13.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
14. 14.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
15. 15.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) vinegar (d) sugar
16. 16.🔍 Which is the odd one out? (a) salt (b) sunlight (c) warm water (d) a magnet
17. 17.True or false: sunlight is something yeast does not need. (a) False (b) True
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) False (b) True
19. 19.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
20. 20.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
21. 21.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
22. 22.True or false: sunlight is something yeast needs. (a) False (b) True
23. 23.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) time (d) warm water
24. 24.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
25. 25.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold water is heavy (d) cold kills sugar
26. 26.⚖️ 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) False (b) True
27. 27.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
28. 28.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) it is food for yeast (d) to colour it
29. 29.⚖️ 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
30. 30.⚖️ 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 keep it the same (b) we change it (c) we measure it
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a magnet (d) sugar
32. 32.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a battery cell (d) a small bottle
34. 34.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) sugar (d) a magnet
35. 35.⚖️ 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
36. 36.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sunlight (d) sugar
37. 37.⚖️ 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
38. 38.🔍 Which is the odd one out? (a) warm water (b) sugar (c) a magnet (d) time
39. 39.True or false: time is something yeast needs. (a) True (b) False
40. 40.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it

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