Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 131 · 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 sunlight to make gas? (a) yeast does not need it (b) yeast needs it
2. 2.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) the yeast is killed (d) it turns to sugar
4. 4.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
6. 6.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
7. 7.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
8. 8.🍞 Which of these is something yeast does not need? (a) sunlight (b) sugar (c) time (d) warm water
9. 9.🛟 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
10. 10.True or false: warm water is needed for the yeast balloon. (a) False (b) True
11. 11.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
12. 12.⚖️ 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 water temperature (b) the amount of sugar (c) the same bottles (d) the amount of yeast
13. 13.True or false: time is something yeast does not need. (a) False (b) True
14. 14.⚖️ 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
15. 15.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) a magnet (d) salt
16. 16.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
17. 17.🍞 Does yeast need warm water 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) a small bottle (b) sugar (c) warm water (d) a battery cell
19. 19.🔍 Which is the odd one out? (a) warm water (b) salt (c) vinegar (d) a magnet
20. 20.🔍 Which is the odd one out? (a) vinegar (b) time (c) warm water (d) sugar
21. 21.⚖️ 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 yeast (b) the amount of water (c) size of the balloon (d) the water temperature
22. 22.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
23. 23.⚖️ 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
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) sugar (d) a battery cell
25. 25.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
26. 26.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) vinegar (d) time
27. 27.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a magnet (c) dry yeast (d) warm water
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) sugar (d) a mirror
30. 30.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little
31. 31.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
32. 32.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) time (b) sugar (c) salt (d) warm water
35. 35.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
36. 36.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
37. 37.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
38. 38.🍞 Which of these is something yeast needs? (a) time (b) sunlight (c) a magnet (d) vinegar
39. 39.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) steam (d) air from outside
40. 40.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it

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