Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 384 · 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 is the odd one out? (a) sugar (b) salt (c) sunlight (d) a magnet
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a balloon (d) a mirror
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a comb (c) dry yeast (d) sugar
4. 4.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) carbon dioxide gas (d) steam
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a small bottle (c) dry yeast (d) a balloon
6. 6.True or false: sunlight is something yeast needs. (a) True (b) False
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a magnet (d) warm water
8. 8.⚖️ 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) size of the balloon (c) the amount of yeast (d) the water temperature
9. 9.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) a mirror (d) dry yeast
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) turmeric powder (c) dry yeast (d) warm water
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 measure it (b) we keep it the same (c) we change it
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a mirror (c) a magnet (d) a comb
13. 13.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
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.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
17. 17.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold water is heavy (d) cold makes it pink
18. 18.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a paper clip (d) warm water
20. 20.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it grows very little (d) it bursts at once
21. 21.⚖️ 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 measure it (b) we change it (c) we keep it the same
22. 22.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) a battery cell (d) a balloon
23. 23.🍞 Which of these is something yeast needs? (a) sunlight (b) warm water (c) salt (d) vinegar
24. 24.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to colour it (d) to make it heavy
25. 25.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) salt (d) warm water
26. 26.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
27. 27.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) throw it at a wall (d) put it in your mouth
29. 29.⚖️ 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
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) a small bottle (c) warm water (d) dry yeast
31. 31.⚖️ 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 amount of water
32. 32.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
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 keep it the same (b) we change it (c) we measure it
34. 34.🍞 Which of these is something yeast does not need? (a) vinegar (b) warm water (c) time (d) sugar
35. 35.True or false: sunlight is something yeast does not need. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) sunlight (b) salt (c) warm water (d) vinegar
37. 37.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
38. 38.⚖️ 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 keep it the same (b) we measure it (c) we change it
39. 39.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
40. 40.⚖️ 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

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