Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 161 · 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 much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
2. 2.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) time (d) vinegar
3. 3.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) salt (d) warm water
5. 5.🛟 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
6. 6.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
7. 7.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a tiny living fungus (d) a kind of stone
8. 8.⚖️ 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 measure it (b) we change it (c) we keep it the same
9. 9.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) a small bottle (c) dry yeast (d) a balloon
10. 10.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to make bread rise (d) to clean floors
11. 11.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
13. 13.⚖️ 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 measure it (b) we keep it the same (c) we change it
14. 14.🍞 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
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of sugar (b) size of the balloon (c) the water temperature (d) the same bottles
16. 16.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
17. 17.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) sugar (d) a battery cell
19. 19.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
20. 20.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
21. 21.🔍 Which is the odd one out? (a) time (b) sunlight (c) warm water (d) sugar
22. 22.🔍 Which is the odd one out? (a) time (b) salt (c) sugar (d) warm water
23. 23.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
24. 24.⚖️ 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 amount of water (b) the water temperature (c) the amount of yeast (d) the same bottles
25. 25.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
26. 26.⚖️ 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 keep it the same (b) we measure it (c) we change it
27. 27.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) it glows (d) the yeast is killed
28. 28.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) steam (d) air from outside
29. 29.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a paper clip (c) a mirror (d) a battery cell
30. 30.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
31. 31.🍞 Which of these is something yeast does not need? (a) sunlight (b) time (c) sugar (d) warm water
32. 32.🔍 Which is the odd one out? (a) salt (b) a magnet (c) sugar (d) vinegar
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) sugar (d) a comb
34. 34.True or false: sunlight is something yeast does not need. (a) False (b) True
35. 35.⚖️ 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) True (b) False
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a magnet (c) a balloon (d) warm water
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) warm water (d) turmeric powder
38. 38.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
39. 39.⚖️ 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 change it (b) we keep it the same (c) we measure it
40. 40.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold slows yeast down (d) cold water is heavy

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