Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 814 · 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.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
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 water”? (a) we measure it (b) we keep it the same (c) we change it
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) sugar (d) a balloon
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
5. 5.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) a magnet
6. 6.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) 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 kept the same. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) a magnet (b) sugar (c) salt (d) vinegar
9. 9.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
11. 11.🍞 Which of these is something yeast needs? (a) sunlight (b) warm water (c) salt (d) a magnet
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) False (b) True
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a mirror (d) a small bottle
14. 14.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) time (d) a magnet
15. 15.⚖️ 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 sugar (b) the amount of water (c) the water temperature (d) the same bottles
16. 16.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) put it in your mouth (d) throw it at a wall
17. 17.⚖️ 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) True (b) False
18. 18.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
19. 19.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) dry yeast (c) turmeric powder (d) a battery cell
20. 20.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) turmeric powder (c) warm water (d) dry yeast
22. 22.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) sugar (d) a battery cell
24. 24.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to wash dishes (d) to clean floors
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.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) salt (d) sugar
27. 27.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
28. 28.⚖️ 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
29. 29.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) air from outside (d) steam
30. 30.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it glows (d) it turns to sugar
31. 31.True or false: warm water is something yeast needs. (a) False (b) True
32. 32.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it sweet (d) to make it heavy
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) dry yeast (d) a magnet
35. 35.⚖️ 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 change it (c) we measure it
36. 36.True or false: sugar is something yeast needs. (a) True (b) False
37. 37.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
38. 38.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it turns yellow (d) it bursts at once
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) sugar (d) a comb
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) turmeric powder (c) sugar (d) a small bottle

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