Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 197 · 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.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
2. 2.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it sweet (d) to make it heavy
3. 3.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it grows much faster (d) it turns yellow
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of yeast (b) size of the balloon (c) the water temperature
6. 6.True or false: sunlight is something yeast needs. (a) False (b) True
7. 7.⚖️ 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
8. 8.True or false: warm water is something yeast needs. (a) True (b) False
9. 9.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
10. 10.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
11. 11.⚖️ 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 change it (c) we measure it
12. 12.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to wash dishes (d) to colour rice
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) sugar (c) a small bottle (d) warm water
14. 14.🔍 Which is the odd one out? (a) time (b) sunlight (c) sugar (d) warm water
15. 15.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
16. 16.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a kind of stone (d) a tiny living fungus
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a battery cell (c) a small bottle (d) a balloon
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a mirror (c) dry yeast (d) a balloon
19. 19.⚖️ 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 water temperature (c) the same bottles (d) the amount of sugar
20. 20.True or false: sugar is something yeast does not need. (a) False (b) True
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) turmeric powder (d) dry yeast
22. 22.⚖️ 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 measure it (c) we change it
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) warm water (c) dry yeast (d) a balloon
24. 24.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
25. 25.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it shrinks to nothing (d) it turns to bread
26. 26.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) sugar (d) time
27. 27.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) time (d) salt
28. 28.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) air from outside (d) smoke
29. 29.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
30. 30.⚖️ 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 change it (b) we keep it the same (c) we measure it
31. 31.⚖️ 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 keep it the same (b) we change it (c) we measure it
32. 32.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
33. 33.True or false: warm water is needed for the yeast balloon. (a) True (b) False
34. 34.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a small bottle (d) a battery cell
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a balloon (c) dry yeast (d) warm water
36. 36.🍞 Which of these is something yeast does not need? (a) a magnet (b) time (c) warm water (d) sugar
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) the water temperature (c) size of the balloon
38. 38.True or false: vinegar is something yeast needs. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) salt (b) sunlight (c) sugar (d) vinegar
40. 40.🔍 Which is the odd one out? (a) time (b) warm water (c) a magnet (d) sugar

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