Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 548 · 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.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to make bread rise (d) to colour rice
2. 2.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
3. 3.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
4. 4.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
5. 5.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
6. 6.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) it is food for yeast (d) to make it sweet
7. 7.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
8. 8.True or false: sugar is something yeast does not need. (a) True (b) False
9. 9.True or false: time is something yeast does not need. (a) True (b) False
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) turmeric powder (d) a balloon
11. 11.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
12. 12.True or false: vinegar is something yeast needs. (a) False (b) True
13. 13.⚖️ 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 measure it (c) we keep it the same
14. 14.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) salt (d) warm water
15. 15.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
16. 16.⚖️ 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 water (c) the amount of yeast (d) the water temperature
17. 17.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) the yeast is killed (d) it grows faster
18. 18.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
19. 19.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
20. 20.True or false: warm water is something yeast does not need. (a) False (b) True
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) dry yeast (c) a balloon (d) sugar
22. 22.True or false: time is something yeast needs. (a) True (b) False
23. 23.⚖️ 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 amount of sugar
24. 24.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.True or false: warm water is needed for the yeast balloon. (a) False (b) True
26. 26.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.⚖️ 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) the amount of yeast (c) size of the balloon
28. 28.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
29. 29.🍞 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
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) dry yeast (c) a battery cell (d) a mirror
31. 31.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
32. 32.⚖️ 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
33. 33.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
34. 34.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) a magnet (d) salt
35. 35.🍞 Which of these is something yeast does not need? (a) warm water (b) vinegar (c) sugar (d) time
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a battery cell (c) a small bottle (d) warm water
37. 37.⚖️ 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) False (b) True
38. 38.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it turns yellow (d) it bursts at once
39. 39.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.True or false: sugar is something yeast needs. (a) False (b) True

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