Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 828 · 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.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a balloon (c) warm water (d) dry yeast
3. 3.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a comb (c) dry yeast (d) a small bottle
5. 5.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) salt (d) warm water
6. 6.🔍 Which is the odd one out? (a) vinegar (b) time (c) salt (d) a magnet
7. 7.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
9. 9.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to colour rice (d) to wash dishes
11. 11.⚖️ 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) size of the balloon (b) the amount of water (c) the water temperature (d) the same bottles
12. 12.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) it is food for yeast (d) to make it sweet
13. 13.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) size of the balloon (c) the water temperature
15. 15.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is bigger (d) the balloon is smaller
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) dry yeast (c) sugar (d) warm water
17. 17.⚖️ 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
18. 18.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) salt
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a battery cell (d) a balloon
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a balloon (c) a battery cell (d) a magnet
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) dry yeast (c) a small bottle (d) warm water
22. 22.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a comb (c) a paper clip (d) sugar
23. 23.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
24. 24.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) salt
25. 25.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
26. 26.⚖️ 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 amount of yeast (c) the amount of water (d) the water temperature
27. 27.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
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.True or false: a magnet is something yeast needs. (a) True (b) False
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a magnet (d) warm water
32. 32.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) time (d) vinegar
33. 33.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
34. 34.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) a magnet (d) time
35. 35.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a paper clip (d) dry yeast
37. 37.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
38. 38.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows
39. 39.⚖️ 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 measure it (c) we keep it the same
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a magnet (d) dry yeast

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