Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 809 · 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.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
2. 2.⚖️ 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
3. 3.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) it grows faster (d) the yeast is killed
4. 4.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of salt (d) a kind of stone
5. 5.⚖️ 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
6. 6.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) sunlight (b) salt (c) time (d) vinegar
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a magnet (d) sugar
9. 9.⚖️ 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
10. 10.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a paper clip (c) a mirror (d) a battery cell
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a balloon (d) turmeric powder
12. 12.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) carbon dioxide gas (d) smoke
14. 14.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) it shrinks to nothing (d) the balloon is smaller
15. 15.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) vinegar (d) salt
16. 16.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) warm water (d) salt
18. 18.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
19. 19.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
20. 20.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) pour it down the sink (d) put it in your mouth
21. 21.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
22. 22.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a mirror (d) warm water
24. 24.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
25. 25.⚖️ 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 keep it the same (c) we change it
26. 26.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) sugar (d) a balloon
28. 28.⚖️ 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 amount of water (b) the water temperature (c) size of the balloon (d) the amount of sugar
29. 29.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
30. 30.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
31. 31.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
32. 32.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) time (d) warm water
33. 33.True or false: salt is something yeast needs. (a) False (b) True
34. 34.⚖️ 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) False (b) True
35. 35.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) sunlight
37. 37.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) to colour it (d) it is food for yeast
38. 38.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a comb (d) a balloon
40. 40.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed

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