Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 314 · 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 warm water for the yeast balloon? (a) not needed (b) needed
2. 2.True or false: warm water is something yeast does not need. (a) True (b) False
3. 3.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
5. 5.⚖️ 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 keep it the same (c) we change it
6. 6.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) sugar (c) a magnet (d) a comb
7. 7.⚖️ 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
8. 8.⚖️ 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) True (b) False
9. 9.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
10. 10.🔮 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
11. 11.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) a magnet (d) salt
12. 12.⚖️ 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
13. 13.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
15. 15.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
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) the amount of water (b) the amount of yeast (c) size of the balloon (d) the water temperature
17. 17.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold kills sugar (d) cold makes it pink
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of yeast (b) the water temperature (c) size of the balloon
19. 19.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
20. 20.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
21. 21.🔍 Which is the odd one out? (a) salt (b) warm water (c) sunlight (d) a magnet
22. 22.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) it is food for yeast (d) to make it heavy
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a small bottle (d) a paper clip
24. 24.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sunlight (d) sugar
25. 25.True or false: a comb is needed for the yeast balloon. (a) True (b) False
26. 26.True or false: time is something yeast needs. (a) True (b) False
27. 27.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
28. 28.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) warm water (d) a mirror
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False
31. 31.⚖️ 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 change it (b) we keep it the same (c) we measure it
32. 32.⚖️ 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 water (c) the amount of sugar (d) size of the balloon
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a balloon (d) turmeric powder
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 what we measure. (a) True (b) False
35. 35.True or false: salt is something yeast does not need. (a) False (b) True
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) a comb (d) dry yeast
37. 37.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
38. 38.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of sugar (d) a kind of stone
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) turmeric powder (c) a mirror (d) a paper clip

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