Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 771 · 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 something yeast needs? (a) vinegar (b) time (c) salt (d) sunlight
2. 2.⚖️ 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
3. 3.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
4. 4.True or false: vinegar is something yeast needs. (a) False (b) True
5. 5.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
6. 6.True or false: time is something yeast does not need. (a) False (b) True
7. 7.⚖️ 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 amount of yeast (c) the water temperature (d) the same bottles
8. 8.⚖️ 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 water
9. 9.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a mirror (d) a small bottle
12. 12.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) a magnet (d) time
13. 13.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) sunlight
14. 14.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it grows very little (d) it bursts at once
15. 15.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) salt
16. 16.True or false: sugar is needed for the yeast balloon. (a) False (b) True
17. 17.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to make it heavy (d) to colour it
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 keep it the same (b) we change it (c) we measure it
19. 19.⚖️ 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
20. 20.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
21. 21.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
23. 23.🍞 Which of these is something yeast does not need? (a) sunlight (b) sugar (c) warm water (d) time
24. 24.True or false: time is something yeast needs. (a) False (b) True
25. 25.⚖️ 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 keep it the same (b) we measure it (c) we change it
26. 26.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) it shrinks to nothing (d) the balloon is smaller
27. 27.⚖️ 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) True (b) False
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) warm water (d) a magnet
29. 29.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
30. 30.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
31. 31.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
32. 32.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.⚖️ 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 sugar
34. 34.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
36. 36.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) warm water (d) turmeric powder
38. 38.🍞 Which of these is something yeast needs? (a) warm water (b) sunlight (c) salt (d) a magnet
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) a balloon (c) warm water (d) dry yeast
40. 40.⚖️ 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 water (c) the water temperature (d) size of the balloon

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