Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 91 · 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 needs? (a) sugar (b) sunlight (c) salt (d) vinegar
2. 2.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to make it sweet (d) to colour it
3. 3.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
4. 4.True or false: a comb is needed for the yeast balloon. (a) True (b) False
5. 5.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
6. 6.True or false: a magnet is something yeast needs. (a) False (b) True
7. 7.⚖️ 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 sugar
8. 8.True or false: time is something yeast does not need. (a) True (b) False
9. 9.True or false: vinegar is something yeast does not need. (a) True (b) False
10. 10.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a small bottle (c) a balloon (d) sugar
12. 12.True or false: warm water is something yeast needs. (a) False (b) True
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a battery cell (c) a small bottle (d) sugar
14. 14.⚖️ 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
15. 15.⚖️ 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
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) dry yeast (c) warm water (d) sugar
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) the water temperature (c) size of the balloon
18. 18.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) salt (d) a magnet
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a battery cell (d) warm water
20. 20.True or false: a magnet is something yeast does not need. (a) False (b) True
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) dry yeast (c) a mirror (d) a magnet
22. 22.True or false: sunlight is something yeast needs. (a) False (b) True
23. 23.⚖️ 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 keep it the same (c) we change it
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) True (b) False
25. 25.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) turmeric powder (c) a paper clip (d) a battery cell
26. 26.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
27. 27.⚖️ 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 change it (c) we measure it
28. 28.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
29. 29.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of sugar (d) a kind of salt
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a mirror (d) a balloon
31. 31.🔍 Which is the odd one out? (a) salt (b) time (c) sugar (d) warm water
32. 32.⚖️ 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
33. 33.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
35. 35.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) turmeric powder (d) a small bottle
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a small bottle (d) a paper clip
37. 37.⚖️ 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
38. 38.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) warm water (d) a magnet
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) False (b) True
40. 40.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot

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