Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 539 · 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) salt (b) a magnet (c) warm water (d) vinegar
2. 2.True or false: warm water is something yeast does not need. (a) True (b) False
3. 3.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) dry yeast (c) a mirror (d) turmeric powder
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a comb (c) a small bottle (d) sugar
6. 6.⚖️ 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 change it (c) we keep it the same
7. 7.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
8. 8.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
9. 9.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) warm water (d) a paper clip
11. 11.⚖️ 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
12. 12.⚖️ 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 yeast (c) the water temperature (d) size of the balloon
13. 13.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
15. 15.⚖️ 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
16. 16.True or false: a magnet is something yeast needs. (a) False (b) True
17. 17.⚖️ 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 change it (c) we keep it the same
18. 18.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
19. 19.True or false: sunlight is something yeast needs. (a) False (b) True
20. 20.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink
21. 21.🧺 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) dry yeast
22. 22.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) sugar (d) salt
23. 23.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.True or false: a comb is needed for the yeast balloon. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) a magnet (b) salt (c) vinegar (d) time
26. 26.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
27. 27.⚖️ 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
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) turmeric powder (d) a balloon
29. 29.⚖️ 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
30. 30.True or false: sugar is something yeast does not need. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sunlight (d) warm water
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a magnet (d) warm water
33. 33.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a mirror (c) turmeric powder (d) a magnet
34. 34.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
35. 35.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of sugar (c) the water temperature (d) the amount of yeast
37. 37.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) turmeric powder (c) a comb (d) a balloon
38. 38.True or false: a magnet is something yeast does not need. (a) False (b) True
39. 39.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
40. 40.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) dry yeast (d) a mirror

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