Yeast Balloon Experiment Worksheet

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

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