Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 525 · 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.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
2. 2.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
3. 3.⚖️ 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) size of the balloon (c) the amount of sugar
4. 4.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
5. 5.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
6. 6.True or false: salt is something yeast does not need. (a) True (b) False
7. 7.⚖️ 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
8. 8.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) sugar (d) time
9. 9.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) a magnet (b) salt (c) vinegar (d) warm water
11. 11.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) time (d) warm water
12. 12.🔮 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
13. 13.🔍 Which is the odd one out? (a) sugar (b) warm water (c) salt (d) time
14. 14.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) a magnet (d) turmeric powder
15. 15.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
16. 16.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
17. 17.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
19. 19.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) dry yeast (d) turmeric powder
21. 21.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
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 change it (b) we measure it (c) we keep it the same
23. 23.⚖️ 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 sugar (b) the water temperature (c) the amount of water (d) size of the balloon
24. 24.True or false: sunlight is something yeast does not need. (a) False (b) True
25. 25.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) steam (d) smoke
26. 26.🔍 Which is the odd one out? (a) time (b) salt (c) a magnet (d) vinegar
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) the water temperature (b) the same bottles (c) size of the balloon
28. 28.True or false: sugar is something yeast needs. (a) True (b) False
29. 29.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it turns yellow (d) it grows much faster
30. 30.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) to colour it (d) it is food for yeast
31. 31.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
32. 32.True or false: time is something yeast does not need. (a) False (b) True
33. 33.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) a magnet (d) sugar
35. 35.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
37. 37.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) a magnet (d) warm water
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a mirror (d) warm water
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 sugar”? (a) we measure it (b) we keep it the same (c) we change it
40. 40.⚖️ 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 amount of yeast (c) the water temperature (d) the amount of sugar

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