Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 642 · 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.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
2. 2.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) sunlight
3. 3.⚖️ 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 keep it the same (c) we change it
4. 4.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
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 measure it (b) we keep it the same (c) we change it
6. 6.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
7. 7.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
8. 8.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) dry yeast (c) a magnet (d) turmeric powder
10. 10.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) sugar (d) vinegar
11. 11.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a kind of stone (d) a tiny living fungus
12. 12.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
13. 13.⚖️ 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 water temperature (b) the amount of sugar (c) the amount of yeast (d) the same bottles
14. 14.⚖️ 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 keep it the same (b) we measure it (c) we change it
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) dry yeast (d) warm water
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) sugar (d) a balloon
17. 17.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) turmeric powder (c) a balloon (d) dry yeast
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) turmeric powder (c) a comb (d) a battery cell
21. 21.⚖️ 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
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
23. 23.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
24. 24.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold kills sugar (c) cold water is heavy (d) cold makes it pink
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) sugar (c) a battery cell (d) turmeric powder
26. 26.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) it is food for yeast (d) to colour it
27. 27.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
28. 28.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
29. 29.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
30. 30.🔍 Which is the odd one out? (a) a magnet (b) salt (c) sugar (d) sunlight
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) warm water (d) sugar
32. 32.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
33. 33.🔮 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
34. 34.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) pour it down the sink (d) throw it at a wall
35. 35.True or false: warm water is needed for the yeast balloon. (a) False (b) True
36. 36.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) it shrinks to nothing (d) the balloon is bigger
37. 37.⚖️ 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) True (b) False
38. 38.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
39. 39.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False

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