Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 646 · 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.⚖️ 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
2. 2.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) a magnet (d) sunlight
3. 3.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) smoke (d) air from outside
4. 4.⚖️ 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 keep it the same (c) we change it
5. 5.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold slows yeast down (d) cold kills sugar
7. 7.True or false: a comb is needed for the yeast balloon. (a) True (b) False
8. 8.True or false: sunlight is something yeast does not need. (a) True (b) False
9. 9.⚖️ 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
10. 10.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) to make it sweet (d) it is food for yeast
11. 11.⚖️ 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 keep it the same (b) we measure it (c) we change it
12. 12.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) time (d) vinegar
13. 13.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
14. 14.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it grows very little (d) it turns yellow
15. 15.⚖️ 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
16. 16.True or false: warm water is something yeast needs. (a) False (b) True
17. 17.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) ice cold (d) very salty
18. 18.True or false: warm water is needed for the yeast balloon. (a) True (b) False
19. 19.True or false: vinegar is something yeast needs. (a) True (b) False
20. 20.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
21. 21.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) vinegar (d) time
22. 22.True or false: sunlight is something yeast needs. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) salt (b) a magnet (c) sunlight (d) warm water
24. 24.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
26. 26.⚖️ 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 water (b) the same bottles (c) the water temperature (d) size of the balloon
27. 27.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
28. 28.True or false: sugar is something yeast does not need. (a) True (b) False
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a balloon (d) a magnet
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the amount of sugar (c) the water temperature (d) size of the balloon
31. 31.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
32. 32.🔍 Which is the odd one out? (a) sugar (b) time (c) sunlight (d) warm water
33. 33.⚖️ 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
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of sugar (b) size of the balloon (c) the water temperature
35. 35.True or false: time is something yeast does not need. (a) False (b) True
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) turmeric powder (c) a battery cell (d) a balloon
37. 37.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a comb (c) warm water (d) a mirror
38. 38.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
39. 39.⚖️ 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 change it (b) we keep it the same (c) we measure it
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) size of the balloon (b) the water temperature (c) the same bottles

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