Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 617 · 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 sugar to make gas? (a) yeast needs it (b) yeast does not need it
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) warm water (c) dry yeast (d) a balloon
3. 3.⚖️ 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 yeast (d) size of the balloon
4. 4.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
5. 5.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
6. 6.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold kills sugar (d) cold water is heavy
7. 7.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) time (d) sugar
8. 8.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) a magnet (d) sugar
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False
10. 10.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
11. 11.⚖️ 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 measure it (b) we change it (c) we keep it the same
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) the water temperature (c) size of the balloon
13. 13.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) vinegar
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 sugar”? (a) we change it (b) we measure it (c) we keep it the same
15. 15.🍞 Which of these is something yeast does not need? (a) salt (b) time (c) warm water (d) sugar
16. 16.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
17. 17.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
18. 18.True or false: a magnet is something yeast does not need. (a) False (b) True
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) sugar (c) warm water (d) dry yeast
21. 21.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
22. 22.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) turmeric powder (c) a small bottle (d) sugar
24. 24.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) it grows faster (d) the yeast is killed
25. 25.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) sugar (d) time
26. 26.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) a magnet (b) salt (c) warm water (d) sunlight
29. 29.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to colour it (d) to make it heavy
30. 30.True or false: salt is something yeast does not need. (a) False (b) True
31. 31.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sunlight (d) sugar
32. 32.⚖️ 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) size of the balloon (c) the water temperature
33. 33.🔮 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
34. 34.⚖️ 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
35. 35.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) warm water (b) time (c) salt (d) sugar
37. 37.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
38. 38.True or false: sunlight is something yeast needs. (a) True (b) False
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) True (b) False
40. 40.⚖️ 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 measure it (b) we keep it the same (c) we change it

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