Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 515 · 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 leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it grows much faster (d) it turns yellow
2. 2.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
4. 4.⚖️ 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
5. 5.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to make bread rise (d) to clean floors
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) dry yeast (d) a paper clip
7. 7.True or false: warm water is needed for the yeast balloon. (a) False (b) True
8. 8.⚖️ 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 change it (b) we keep it the same (c) we measure it
9. 9.⚖️ 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 same bottles (b) the amount of sugar (c) the amount of yeast (d) the water temperature
10. 10.True or false: sunlight is something yeast needs. (a) True (b) False
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a battery cell (c) dry yeast (d) warm water
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) the water temperature (b) size of the balloon (c) the amount of water (d) the same bottles
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) salt (d) warm water
15. 15.🔍 Which is the odd one out? (a) salt (b) a magnet (c) time (d) vinegar
16. 16.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) a magnet (d) vinegar
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a magnet (c) warm water (d) dry yeast
18. 18.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) air from outside (d) steam
19. 19.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of stone (d) a kind of sugar
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) sugar (c) warm water (d) a balloon
21. 21.🛟 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
22. 22.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
23. 23.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
24. 24.⚖️ 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
25. 25.⚖️ 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
26. 26.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.True or false: warm water is something yeast needs. (a) False (b) True
28. 28.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
29. 29.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a battery cell (c) sugar (d) turmeric powder
30. 30.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
31. 31.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) sugar (c) warm water (d) a balloon
33. 33.True or false: sugar is something yeast does not need. (a) True (b) False
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
35. 35.⚖️ 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 keep it the same (b) we change it (c) we measure it
36. 36.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we change it (b) we keep it the same (c) we measure it
38. 38.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) True (b) False
40. 40.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed

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