Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 744 · 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.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
3. 3.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it bursts at once (d) it turns yellow
4. 4.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
5. 5.⚖️ 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
6. 6.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
7. 7.⚖️ 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
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a comb (c) dry yeast (d) sugar
9. 9.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) turmeric powder (d) dry yeast
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a magnet (d) dry yeast
12. 12.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
13. 13.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) turmeric powder (d) a balloon
15. 15.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) sunlight
16. 16.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) True (b) False
18. 18.🍞 Which of these is something yeast needs? (a) time (b) vinegar (c) sunlight (d) a magnet
19. 19.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a balloon (c) dry yeast (d) a small bottle
21. 21.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) sugar (d) salt
22. 22.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
23. 23.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) ice cold (d) warm, not hot
24. 24.⚖️ 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) True (b) False
25. 25.🔍 Which is the odd one out? (a) warm water (b) sugar (c) sunlight (d) time
26. 26.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) it shrinks to nothing (d) the balloon is bigger
27. 27.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
28. 28.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) time (d) warm water
29. 29.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) a small bottle (d) a magnet
31. 31.True or false: warm water is needed for the yeast balloon. (a) True (b) False
32. 32.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) warm water (d) salt
33. 33.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam
34. 34.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
35. 35.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a comb (c) sugar (d) dry yeast
38. 38.⚖️ 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 yeast (c) the amount of sugar (d) the water temperature
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a mirror (c) warm water (d) sugar
40. 40.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) throw it at a wall (d) pour it down the sink

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