Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 742 · 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.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
3. 3.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) sunlight
4. 4.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
5. 5.⚖️ 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 change it (b) we measure it (c) we keep it the same
6. 6.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
7. 7.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
8. 8.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) sugar (d) a magnet
10. 10.⚖️ 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
11. 11.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it grows much faster (d) it turns yellow
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of yeast (b) the same bottles (c) size of the balloon (d) the water temperature
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) a balloon (d) turmeric powder
14. 14.True or false: time is something yeast does not need. (a) False (b) True
15. 15.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) the yeast is killed (d) it turns to sugar
16. 16.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
17. 17.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) vinegar (d) a magnet
18. 18.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a battery cell (c) turmeric powder (d) a mirror
19. 19.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
20. 20.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) sugar (d) time
21. 21.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to clean floors (d) to colour rice
22. 22.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to colour it (d) to make it sweet
23. 23.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) dry yeast (d) a comb
25. 25.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) a paper clip (d) a small bottle
27. 27.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) steam (d) air from outside
28. 28.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
29. 29.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) a comb (d) a balloon
30. 30.⚖️ 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
31. 31.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) sugar (d) time
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) a balloon (d) a magnet
33. 33.True or false: warm water is something yeast does not need. (a) True (b) False
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False
35. 35.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.⚖️ 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
37. 37.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) the water temperature (c) size of the balloon
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) dry yeast (d) a mirror
40. 40.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) it turns to bread (d) the balloon is smaller

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