Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 675 · 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 (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) it turns to sugar (d) the yeast is killed
2. 2.⚖️ 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) True (b) False
3. 3.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a comb (d) a small bottle
5. 5.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.⚖️ 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
7. 7.🍞 Which of these is something yeast needs? (a) sugar (b) a magnet (c) salt (d) vinegar
8. 8.🔍 Which is the odd one out? (a) time (b) sugar (c) a magnet (d) warm water
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
10. 10.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
11. 11.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
12. 12.⚖️ 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
13. 13.⚖️ 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
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) a magnet (d) warm water
15. 15.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it sweet (d) to make it heavy
16. 16.⚖️ 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 measure it (c) we keep it the same
17. 17.True or false: warm water is needed for the yeast balloon. (a) False (b) True
18. 18.⚖️ 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 sugar (b) the amount of yeast (c) size of the balloon (d) the amount of water
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) sugar (c) a small bottle (d) dry yeast
20. 20.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.⚖️ 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
22. 22.True or false: sugar is something yeast does not need. (a) True (b) False
23. 23.True or false: warm water is something yeast needs. (a) True (b) False
24. 24.⚖️ 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 same bottles (b) the amount of yeast (c) the water temperature (d) the amount of sugar
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) a comb (d) a small bottle
26. 26.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) sugar (d) time
27. 27.True or false: vinegar is something yeast does not need. (a) False (b) True
28. 28.⚖️ 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) True (b) False
29. 29.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
30. 30.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
31. 31.⚖️ 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) True (b) False
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) warm water (d) a magnet
33. 33.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) vinegar (d) sugar
34. 34.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
35. 35.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) sunlight (d) warm water
36. 36.🍞 Which of these is something yeast needs? (a) salt (b) time (c) vinegar (d) a magnet
37. 37.True or false: time is something yeast needs. (a) True (b) False
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a battery cell (c) sugar (d) a balloon
39. 39.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
40. 40.🔍 Which is the odd one out? (a) sunlight (b) salt (c) sugar (d) a magnet

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