Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 645 · 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.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) a paper clip (d) dry yeast
2. 2.True or false: vinegar is something yeast does not need. (a) True (b) False
3. 3.⚖️ 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 sugar (b) the water temperature (c) size of the balloon
4. 4.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
5. 5.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) it is food for yeast (d) to make it heavy
6. 6.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sunlight (d) warm water
7. 7.⚖️ 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
8. 8.True or false: salt is something yeast does not need. (a) False (b) True
9. 9.True or false: vinegar is something yeast needs. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) salt (b) sunlight (c) time (d) vinegar
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a battery cell (d) dry yeast
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a comb (d) dry yeast
13. 13.True or false: warm water is something yeast does not need. (a) False (b) True
14. 14.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) vinegar
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) warm water (d) a paper clip
16. 16.⚖️ 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
17. 17.⚖️ 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 measure it (b) we change it (c) we keep it the same
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) a balloon (d) a magnet
19. 19.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.🔍 Which is the odd one out? (a) vinegar (b) time (c) sugar (d) warm water
21. 21.⚖️ 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 sugar (c) the same bottles (d) the amount of yeast
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
23. 23.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a comb (c) a mirror (d) a paper clip
24. 24.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) sunlight
25. 25.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
26. 26.⚖️ 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
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) a small bottle (d) turmeric powder
28. 28.⚖️ 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 change it (b) we measure it (c) we keep it the same
29. 29.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
30. 30.True or false: a balloon is not needed for the yeast balloon. (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? What do we do with “the amount of sugar”? (a) we change it (b) we keep it the same (c) we measure it
33. 33.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) salt (d) a magnet
34. 34.True or false: warm water is needed for the yeast balloon. (a) True (b) False
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) sugar (d) a comb
36. 36.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a kind of stone (d) a tiny living fungus
37. 37.⚖️ 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 water temperature
38. 38.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
39. 39.True or false: sunlight is something yeast does not need. (a) True (b) False
40. 40.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down

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