Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 899 · 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 sunlight to make gas? (a) yeast needs it (b) yeast does not need it
2. 2.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) it is food for yeast (d) to make it sweet
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 water temperature (b) the amount of water (c) size of the balloon
4. 4.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) sunlight (d) vinegar
5. 5.🍞 Which of these is something yeast needs? (a) warm water (b) sunlight (c) vinegar (d) a magnet
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) dry yeast (d) a magnet
7. 7.True or false: vinegar is something yeast does not need. (a) False (b) True
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) dry yeast (d) sugar
9. 9.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) vinegar (d) a magnet
10. 10.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a balloon (d) a comb
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
13. 13.🍞 Which of these is something yeast needs? (a) a magnet (b) sugar (c) sunlight (d) vinegar
14. 14.True or false: salt is something yeast does not need. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) sunlight
16. 16.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
17. 17.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
18. 18.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
19. 19.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
20. 20.⚖️ 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
21. 21.⚖️ 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
22. 22.True or false: vinegar is something yeast needs. (a) False (b) True
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) False (b) True
24. 24.⚖️ 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
25. 25.⚖️ 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
26. 26.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it turns yellow (d) it bursts at once
27. 27.True or false: sugar is something yeast needs. (a) True (b) False
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) sugar (d) a battery cell
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a magnet (d) a small bottle
30. 30.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a small bottle (d) a comb
32. 32.⚖️ 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
33. 33.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
34. 34.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a magnet (c) a comb (d) a battery cell
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) turmeric powder (c) a small bottle (d) dry yeast
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a mirror (c) a balloon (d) warm water
37. 37.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a mirror (c) a battery cell (d) a magnet
38. 38.⚖️ 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) True (b) False
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a mirror (c) a small bottle (d) sugar
40. 40.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed

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