Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 188 · 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.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a paper clip (c) warm water (d) dry yeast
3. 3.⚖️ 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 keep it the same (c) we change it
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a magnet (d) a balloon
5. 5.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) sugar (d) salt
6. 6.🔍 Which is the odd one out? (a) a magnet (b) sugar (c) vinegar (d) sunlight
7. 7.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
8. 8.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
9. 9.True or false: a magnet is something yeast does not need. (a) False (b) True
10. 10.True or false: vinegar is something yeast does not need. (a) True (b) False
11. 11.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
12. 12.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
13. 13.⚖️ 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) size of the balloon (c) the same bottles (d) the water temperature
14. 14.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a mirror (d) a small bottle
16. 16.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
17. 17.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
18. 18.True or false: sunlight is something yeast needs. (a) True (b) False
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
20. 20.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to wash dishes (d) to make bread rise
21. 21.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) put it in your mouth (d) pour it down the sink
22. 22.⚖️ 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 measure it (c) we change it
23. 23.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a paper clip (c) a small bottle (d) dry yeast
25. 25.⚖️ 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
26. 26.⚖️ 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) False (b) True
27. 27.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
28. 28.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
29. 29.⚖️ 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 sugar (b) the water temperature (c) size of the balloon
30. 30.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
31. 31.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
32. 32.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
33. 33.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
34. 34.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a balloon (d) a battery cell
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) dry yeast (c) a magnet (d) a paper clip
37. 37.🔍 Which is the odd one out? (a) time (b) sugar (c) sunlight (d) warm water
38. 38.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) sugar (d) time
39. 39.🔍 Which is the odd one out? (a) salt (b) sugar (c) warm water (d) time
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) a comb (d) sugar

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