Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 904 · 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? What do we do with “the amount of water”? (a) we keep it the same (b) we measure it (c) we change it
2. 2.⚖️ 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
3. 3.True or false: time is something yeast needs. (a) False (b) True
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a comb (c) dry yeast (d) a balloon
5. 5.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) it turns to bread (d) the balloon is smaller
6. 6.⚖️ 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 same bottles (b) the water temperature (c) the amount of water (d) the amount of sugar
7. 7.🔍 Which is the odd one out? (a) sugar (b) salt (c) sunlight (d) vinegar
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) sugar (d) turmeric powder
9. 9.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) salt (d) time
10. 10.⚖️ 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) False (b) True
11. 11.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) it turns to sugar (d) the yeast is killed
12. 12.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
13. 13.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
14. 14.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to clean floors (d) to make bread rise
15. 15.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) sugar (d) time
16. 16.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
17. 17.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a magnet (c) a comb (d) a mirror
18. 18.🔍 Which is the odd one out? (a) sunlight (b) time (c) warm water (d) sugar
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) a small bottle (d) warm water
20. 20.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it sweet (d) to make it heavy
21. 21.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
22. 22.True or false: time is something yeast does not need. (a) False (b) True
23. 23.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink
24. 24.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) carbon dioxide gas (d) air from outside
25. 25.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a balloon (c) sugar (d) dry yeast
27. 27.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it turns yellow (d) it grows much faster
28. 28.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) time (d) a magnet
29. 29.⚖️ 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
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a paper clip (d) a balloon
31. 31.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) warm water (c) a small bottle (d) dry yeast
34. 34.True or false: warm water is something yeast needs. (a) True (b) False
35. 35.⚖️ 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 measure it (c) we keep it the same
36. 36.True or false: a magnet is something yeast needs. (a) False (b) True
37. 37.⚖️ 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 measure it (b) we change it (c) we keep it the same
38. 38.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the amount of yeast (c) size of the balloon (d) the water temperature
40. 40.🔍 Which is the odd one out? (a) sugar (b) time (c) a magnet (d) warm water

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