Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 475 · 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 wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it turns to bread (d) it shrinks to nothing
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) warm water (c) a balloon (d) dry yeast
3. 3.⚖️ 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) True (b) False
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 amount of yeast (c) the water temperature
5. 5.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) turmeric powder (c) a battery cell (d) a magnet
6. 6.🔍 Which is the odd one out? (a) sugar (b) time (c) salt (d) warm water
7. 7.🔮 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
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) warm water (d) a balloon
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a balloon (d) a magnet
10. 10.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.🍞 Which of these is something yeast needs? (a) time (b) vinegar (c) a magnet (d) salt
12. 12.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
13. 13.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
14. 14.True or false: warm water is needed for the yeast balloon. (a) False (b) True
15. 15.True or false: sugar is something yeast needs. (a) False (b) True
16. 16.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a comb (c) a battery cell (d) a magnet
17. 17.⚖️ 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
18. 18.⚖️ 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
19. 19.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to make it sweet (d) to colour it
20. 20.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) vinegar
21. 21.⚖️ 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 measure it (b) we keep it the same (c) we change it
22. 22.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) salt (d) sugar
23. 23.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) a magnet (d) sugar
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) a small bottle (d) a mirror
25. 25.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to wash dishes (d) to make bread rise
26. 26.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows
27. 27.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) pour it down the sink (d) throw it at a wall
29. 29.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
30. 30.True or false: time is something yeast does not need. (a) True (b) False
31. 31.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
32. 32.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) True (b) False
34. 34.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
35. 35.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) a magnet (d) sugar
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) dry yeast (d) turmeric powder
37. 37.⚖️ 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 change it (b) we keep it the same (c) we measure it
38. 38.⚖️ 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 change it (b) we keep it the same (c) we measure it
39. 39.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) time (d) a magnet
40. 40.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) sunlight (d) warm water

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