Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 786 · 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 of these is something yeast does not need? (a) sugar (b) salt (c) time (d) warm water
2. 2.True or false: warm water is needed for the yeast balloon. (a) False (b) True
3. 3.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
4. 4.🔍 Which is the odd one out? (a) sugar (b) warm water (c) salt (d) time
5. 5.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) warm water (c) a magnet (d) turmeric powder
7. 7.True or false: a magnet is not needed for the yeast balloon. (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 same bottles”? (a) we keep it the same (b) we change it (c) we measure it
9. 9.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.⚖️ 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 keep it the same (b) we measure it (c) we change it
11. 11.⚖️ 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) size of the balloon (b) the amount of yeast (c) the same bottles (d) the water temperature
12. 12.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) salt (d) time
13. 13.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
14. 14.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
15. 15.⚖️ 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 change it (b) we measure it (c) we keep it the same
16. 16.True or false: salt is something yeast needs. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) sugar (b) warm water (c) sunlight (d) time
18. 18.🍞 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
19. 19.⚖️ 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 sugar (c) the water temperature (d) the amount of water
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) sugar (c) a mirror (d) turmeric powder
21. 21.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) it turns to sugar (d) the yeast is killed
22. 22.🍞 Which of these is something yeast needs? (a) warm water (b) salt (c) sunlight (d) vinegar
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) warm water (d) a paper clip
24. 24.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) to colour it (d) it is food for yeast
25. 25.⚖️ 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) True (b) False
26. 26.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) sugar (d) a mirror
28. 28.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) keep it for a month (d) throw it at a wall
29. 29.⚖️ 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 change it (b) we measure it (c) we keep it the same
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) turmeric powder (d) sugar
31. 31.🍞 Which of these is something yeast does not need? (a) warm water (b) sunlight (c) time (d) sugar
32. 32.🍞 Which of these is something yeast does not need? (a) sugar (b) vinegar (c) warm water (d) time
33. 33.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
34. 34.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of stone (d) a kind of salt
35. 35.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
36. 36.True or false: warm water is something yeast needs. (a) False (b) True
37. 37.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
38. 38.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.True or false: time is something yeast needs. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) time (d) warm water

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