Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 177 · 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 mirror is needed for the yeast balloon. (a) True (b) False
2. 2.⚖️ 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
3. 3.⚖️ 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
4. 4.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) sunlight
5. 5.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) a battery cell (d) dry yeast
6. 6.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to colour rice (d) to make bread rise
7. 7.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
8. 8.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) warm water (c) a mirror (d) turmeric powder
9. 9.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) salt (d) sugar
10. 10.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) it shrinks to nothing (d) the balloon is bigger
11. 11.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
12. 12.⚖️ 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 yeast (c) the water temperature (d) the amount of sugar
13. 13.True or false: salt is something yeast does not need. (a) False (b) True
14. 14.⚖️ 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 change it (c) we keep it the same
15. 15.⚖️ 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
16. 16.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
17. 17.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
18. 18.True or false: a magnet is something yeast does not need. (a) False (b) True
19. 19.🔮 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
20. 20.True or false: sunlight is something yeast needs. (a) False (b) True
21. 21.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) ice cold (d) boiling hot
22. 22.⚖️ 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
23. 23.⚖️ 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 measure it (c) we change it
24. 24.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) to colour it (d) it is food for yeast
25. 25.🔍 Which is the odd one out? (a) a magnet (b) salt (c) sunlight (d) time
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a paper clip (c) warm water (d) a small bottle
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) turmeric powder (d) sugar
28. 28.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
29. 29.True or false: sugar is something yeast does not need. (a) False (b) True
30. 30.True or false: warm water is needed for the yeast balloon. (a) False (b) True
31. 31.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a small bottle (d) a mirror
33. 33.🍞 Which of these is something yeast does not need? (a) a magnet (b) sugar (c) warm water (d) time
34. 34.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
35. 35.True or false: salt is something yeast needs. (a) True (b) False
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) a mirror (d) a small bottle
37. 37.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
38. 38.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) a magnet (d) salt
39. 39.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.⚖️ 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

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