Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 881 · 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.True or false: sunlight is something yeast needs. (a) True (b) False
2. 2.⚖️ 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
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) sugar (d) warm water
4. 4.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) sunlight
5. 5.⚖️ 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
6. 6.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
7. 7.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to make bread rise (d) to clean floors
8. 8.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) turmeric powder (d) a small bottle
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) a small bottle (c) dry yeast (d) warm water
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a battery cell (c) a paper clip (d) a mirror
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a magnet (c) a balloon (d) dry yeast
12. 12.True or false: sunlight is something yeast does not need. (a) True (b) False
13. 13.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) warm water (d) salt
14. 14.⚖️ 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 measure it (c) we keep it the same
15. 15.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) a small bottle (d) a battery cell
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a mirror (c) a balloon (d) sugar
18. 18.🔮 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
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) the same bottles (b) the amount of yeast (c) size of the balloon (d) the amount of water
20. 20.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
21. 21.⚖️ 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 water temperature (c) the amount of water (d) the same bottles
22. 22.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) sugar (d) time
23. 23.⚖️ 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
24. 24.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
25. 25.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) salt (b) vinegar (c) a magnet (d) time
27. 27.⚖️ 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 water temperature (c) the amount of yeast
28. 28.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
29. 29.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
30. 30.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold slows yeast down (d) cold kills sugar
31. 31.⚖️ 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) the same bottles (c) size of the balloon
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) sugar (c) a balloon (d) warm water
33. 33.⚖️ 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) False (b) True
34. 34.True or false: warm water is something yeast does not need. (a) True (b) False
35. 35.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) smoke (d) air from outside
36. 36.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) a magnet (d) sunlight
38. 38.🔮 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
39. 39.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
40. 40.⚖️ 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) the amount of sugar (c) size of the balloon

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