Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 44 · 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.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
2. 2.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) salt (d) vinegar
4. 4.⚖️ 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) False (b) True
5. 5.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
6. 6.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) vinegar
7. 7.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a tiny living fungus (d) a kind of sugar
8. 8.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
9. 9.⚖️ 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 sugar (c) size of the balloon
10. 10.🍞 Which of these is something yeast does not need? (a) time (b) sunlight (c) sugar (d) warm water
11. 11.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) salt (d) sunlight
12. 12.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) salt (d) sugar
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) warm water (d) a mirror
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a balloon (c) a small bottle (d) sugar
15. 15.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a balloon (d) a magnet
18. 18.⚖️ 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
19. 19.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
20. 20.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) the yeast is killed (d) it turns to sugar
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a mirror (c) warm water (d) a balloon
22. 22.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) a paper clip (d) sugar
24. 24.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) warm water (d) a paper clip
26. 26.🍞 Which of these is something yeast needs? (a) warm water (b) salt (c) sunlight (d) a magnet
27. 27.⚖️ 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
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a battery cell (c) dry yeast (d) sugar
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) warm water (d) turmeric powder
30. 30.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
31. 31.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
32. 32.True or false: salt is something yeast does not need. (a) False (b) True
33. 33.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
34. 34.⚖️ 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) size of the balloon (c) the same bottles
35. 35.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) to make it heavy (d) it is food for yeast
36. 36.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to clean floors (d) to colour rice
37. 37.True or false: dry yeast is 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? True or false: the amount of yeast is kept the same. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) time (b) sunlight (c) warm water (d) sugar
40. 40.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) salt (d) sugar

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