Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 887 · 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.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) sunlight (d) sugar
2. 2.⚖️ 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
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) size of the balloon (b) the water temperature (c) the amount of yeast
4. 4.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
5. 5.⚖️ 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 same bottles (b) the amount of sugar (c) the water temperature (d) size of the balloon
6. 6.⚖️ 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 amount of water (c) the water temperature
7. 7.True or false: salt is something yeast does not need. (a) True (b) False
8. 8.⚖️ 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
9. 9.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) warm water (d) salt
10. 10.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.True or false: warm water is something yeast does not need. (a) True (b) False
12. 12.True or false: time is something yeast does not need. (a) True (b) False
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) turmeric powder (c) a small bottle (d) dry yeast
14. 14.🔍 Which is the odd one out? (a) warm water (b) salt (c) time (d) sugar
15. 15.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) air from outside (d) steam
16. 16.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
17. 17.True or false: sugar is something yeast does not need. (a) False (b) True
18. 18.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
20. 20.🍞 Which of these is something yeast does not need? (a) vinegar (b) warm water (c) time (d) sugar
21. 21.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) to make it sweet (d) it is food for yeast
22. 22.True or false: a magnet is something yeast needs. (a) True (b) False
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
24. 24.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
25. 25.⚖️ 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 water (c) the same bottles (d) the amount of sugar
26. 26.True or false: warm water is needed for the yeast balloon. (a) False (b) True
27. 27.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold kills sugar (d) cold water is heavy
28. 28.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) very salty (d) boiling hot
29. 29.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) sugar (d) a comb
31. 31.⚖️ 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 measure it (c) we change it
32. 32.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
33. 33.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) it glows (d) the yeast is killed
34. 34.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) sugar (d) salt
35. 35.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) time (d) vinegar
36. 36.True or false: sugar is something yeast needs. (a) False (b) True
37. 37.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it turns yellow (d) it bursts at once
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) a small bottle (d) warm water
39. 39.⚖️ 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
40. 40.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed

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