Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 330 · 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.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
2. 2.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) steam (d) carbon dioxide gas
3. 3.🛟 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
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a balloon (c) turmeric powder (d) a battery cell
5. 5.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) it turns to sugar (d) the yeast is killed
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) the water temperature (b) size of the balloon (c) the amount of water
8. 8.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a comb (c) a small bottle (d) a paper clip
9. 9.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a mirror (c) a comb (d) a magnet
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a magnet (d) a balloon
11. 11.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) a magnet (d) salt
12. 12.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.True or false: warm water is something yeast needs. (a) True (b) False
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 measure it (b) we change it (c) we keep it the same
15. 15.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to colour rice (d) to clean floors
16. 16.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
17. 17.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
18. 18.⚖️ 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
19. 19.⚖️ 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 water temperature (d) the same bottles
20. 20.⚖️ 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
21. 21.🍞 Which of these is something yeast does not need? (a) warm water (b) vinegar (c) sugar (d) time
22. 22.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sunlight (d) sugar
23. 23.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
24. 24.True or false: a magnet is something yeast does not need. (a) False (b) True
25. 25.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
26. 26.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
27. 27.True or false: vinegar is something yeast does not need. (a) True (b) False
28. 28.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) salt
29. 29.⚖️ 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
30. 30.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
31. 31.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
32. 32.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.🔍 Which is the odd one out? (a) time (b) sugar (c) sunlight (d) warm water
34. 34.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) salt (d) time
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) dry yeast (c) warm water (d) a balloon
36. 36.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
37. 37.⚖️ 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 keep it the same (c) we change it
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) warm water (c) dry yeast (d) a small bottle
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a battery cell (c) a small bottle (d) sugar
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) size of the balloon (c) the amount of yeast

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