Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 609 · 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.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
2. 2.⚖️ 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
3. 3.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) turmeric powder (d) dry yeast
5. 5.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) salt
7. 7.⚖️ 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 change it (c) we measure it
8. 8.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) air from outside (d) smoke
9. 9.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
10. 10.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it turns yellow (d) it grows much faster
11. 11.🍞 Which of these is something yeast needs? (a) a magnet (b) time (c) sunlight (d) salt
12. 12.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) warm water (c) sugar (d) a small bottle
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) sugar (d) a mirror
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
16. 16.⚖️ 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) size of the balloon (c) the same bottles (d) the water temperature
17. 17.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) sunlight (d) time
18. 18.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) time (d) sugar
19. 19.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) warm water (d) time
20. 20.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
21. 21.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
22. 22.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a kind of stone (d) a tiny living fungus
23. 23.⚖️ 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 same bottles
24. 24.⚖️ 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
25. 25.⚖️ 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
26. 26.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
28. 28.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) sunlight (d) sugar
29. 29.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) salt (b) sugar (c) sunlight (d) a magnet
31. 31.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a magnet (c) turmeric powder (d) a mirror
32. 32.True or false: sunlight is something yeast does not need. (a) True (b) False
33. 33.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a battery cell (c) dry yeast (d) warm water
35. 35.True or false: sugar is something yeast needs. (a) True (b) False
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
38. 38.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) 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 keep it the same (b) we change it (c) we measure it
40. 40.True or false: sunlight is something yeast needs. (a) True (b) False

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