Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 353 · 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.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
2. 2.True or false: a magnet is something yeast needs. (a) False (b) True
3. 3.🛟 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
4. 4.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) a magnet (d) vinegar
5. 5.⚖️ 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 sugar (b) the water temperature (c) size of the balloon (d) the same bottles
6. 6.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) a paper clip (d) sugar
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) a balloon (d) a comb
9. 9.⚖️ 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
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a balloon (c) a paper clip (d) sugar
11. 11.⚖️ 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
12. 12.⚖️ 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 measure it (b) we change it (c) we keep it the same
13. 13.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) warm water (b) salt (c) time (d) sugar
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) sugar (c) warm water (d) a balloon
17. 17.True or false: time is something yeast does not need. (a) True (b) False
18. 18.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
20. 20.True or false: salt is something yeast needs. (a) False (b) True
21. 21.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows
23. 23.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) sunlight
24. 24.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) warm water (d) sugar
26. 26.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
27. 27.True or false: a magnet is something yeast does not need. (a) True (b) False
28. 28.True or false: sugar is something yeast does not need. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) vinegar (b) salt (c) a magnet (d) warm water
30. 30.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam
31. 31.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
32. 32.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) warm water (d) turmeric powder
34. 34.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) salt
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
36. 36.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
37. 37.True or false: sugar is something yeast needs. (a) False (b) True
38. 38.⚖️ 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
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a mirror (c) sugar (d) a balloon
40. 40.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it heavy (d) to make it sweet

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