Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 943 · 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) sunlight (b) time (c) a magnet (d) salt
2. 2.⚖️ 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
3. 3.⚖️ 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
4. 4.🛟 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
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) turmeric powder (d) dry yeast
6. 6.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (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 water temperature”? (a) we measure it (b) we keep it the same (c) we change it
9. 9.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a paper clip (d) warm water
11. 11.⚖️ 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) False (b) True
12. 12.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
13. 13.🔮 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
14. 14.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) sugar (d) a mirror
17. 17.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) a magnet (d) salt
18. 18.⚖️ 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 measure it (b) we change it (c) we keep it the same
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) False (b) True
20. 20.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a balloon (c) sugar (d) dry yeast
22. 22.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a balloon (c) turmeric powder (d) dry yeast
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) a balloon (d) a mirror
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a small bottle (d) a mirror
26. 26.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) vinegar
27. 27.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) sugar (d) a magnet
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a mirror (c) a balloon (d) dry yeast
29. 29.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
30. 30.⚖️ 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 keep it the same (c) we measure it
31. 31.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) a magnet (d) time
32. 32.🔮 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
33. 33.⚖️ 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 change it (c) we keep it the same
34. 34.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
35. 35.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) it is food for yeast (d) to make it heavy
36. 36.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
37. 37.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
38. 38.⚖️ 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 yeast (b) the water temperature (c) size of the balloon
39. 39.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to clean floors (d) to colour rice

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