Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 368 · 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.True or false: sugar is something yeast does not need. (a) True (b) False
2. 2.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
3. 3.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
4. 4.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a mirror (c) a paper clip (d) a battery cell
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the amount of yeast
6. 6.⚖️ 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
7. 7.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is bigger (d) the balloon is smaller
8. 8.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) throw it at a wall (d) put it in your mouth
9. 9.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
10. 10.True or false: salt is something yeast needs. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) warm water (b) time (c) a magnet (d) sugar
12. 12.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) sunlight (d) salt
13. 13.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
14. 14.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the same bottles (c) the amount of yeast (d) the water temperature
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) the same bottles (c) size of the balloon
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a battery cell (c) warm water (d) a balloon
18. 18.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam
19. 19.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to make it heavy (d) to colour it
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) False (b) True
21. 21.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) warm water (c) a small bottle (d) sugar
23. 23.⚖️ 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 measure it (b) we change it (c) we keep it the same
24. 24.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
25. 25.⚖️ 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) size of the balloon (c) the amount of yeast (d) the same bottles
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) turmeric powder (c) sugar (d) a small bottle
27. 27.⚖️ 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) True (b) False
28. 28.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) dry yeast (d) a paper clip
30. 30.⚖️ 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 keep it the same (b) we change it (c) we measure it
31. 31.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
32. 32.True or false: time is something yeast does not need. (a) True (b) False
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a magnet (c) dry yeast (d) sugar
34. 34.True or false: sunlight is something yeast needs. (a) True (b) False
35. 35.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) salt (d) warm water
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) warm water (d) turmeric powder
37. 37.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
38. 38.True or false: vinegar is something yeast needs. (a) False (b) True
39. 39.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
40. 40.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed

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