Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 931 · 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.⚖️ 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
2. 2.⚖️ 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
3. 3.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) salt
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) turmeric powder (d) warm water
5. 5.⚖️ 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) False (b) True
6. 6.⚖️ 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) False (b) True
7. 7.🔍 Which is the odd one out? (a) time (b) sunlight (c) warm water (d) sugar
8. 8.🔮 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
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a mirror (d) warm water
10. 10.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
11. 11.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) dry yeast (d) a comb
13. 13.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a balloon (c) a battery cell (d) a magnet
14. 14.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to wash dishes (d) to make bread rise
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) True (b) False
16. 16.⚖️ 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) True (b) False
17. 17.⚖️ 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
18. 18.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) sugar (c) a battery cell (d) a mirror
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a paper clip (c) a small bottle (d) warm water
22. 22.True or false: a magnet is something yeast needs. (a) False (b) True
23. 23.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
24. 24.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
25. 25.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
26. 26.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
27. 27.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
28. 28.⚖️ 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
29. 29.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
30. 30.🍞 Which of these is something yeast needs? (a) salt (b) warm water (c) a magnet (d) vinegar
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the water temperature”? (a) we change it (b) we keep it the same (c) we measure it
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) size of the balloon (b) the same bottles (c) the water temperature
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a battery cell (c) sugar (d) a small bottle
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) True (b) False
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) False (b) True
36. 36.⚖️ 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 same bottles (c) the amount of yeast (d) size of the balloon
37. 37.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) ice cold (d) boiling hot
38. 38.⚖️ 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
39. 39.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
40. 40.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed

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