Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 149 · 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 a small bottle for the yeast balloon? (a) needed (b) not needed
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
3. 3.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
4. 4.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) ice cold (d) warm, not hot
5. 5.⚖️ 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
6. 6.🍞 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
7. 7.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
8. 8.🔍 Which is the odd one out? (a) warm water (b) time (c) a magnet (d) sugar
9. 9.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.⚖️ 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
11. 11.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it grows much faster (d) it turns yellow
13. 13.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
14. 14.⚖️ 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 measure it (c) we change it
15. 15.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a balloon (c) a battery cell (d) a mirror
16. 16.⚖️ 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
17. 17.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) dry yeast (c) a battery cell (d) a comb
18. 18.🍞 Which of these is something yeast does not need? (a) salt (b) time (c) sugar (d) warm water
19. 19.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) throw it at a wall (d) keep it for a month
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.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
22. 22.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
23. 23.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
24. 24.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
25. 25.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
26. 26.⚖️ 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
27. 27.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) sugar (d) turmeric powder
29. 29.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) sugar (d) vinegar
30. 30.True or false: vinegar is something yeast does not need. (a) True (b) False
31. 31.⚖️ 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 yeast (b) the water temperature (c) size of the balloon
32. 32.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
33. 33.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) steam (d) carbon dioxide gas
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we measure it (b) we keep it the same (c) we change it
35. 35.True or false: salt is something yeast needs. (a) False (b) True
36. 36.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a battery cell (c) dry yeast (d) a balloon
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) a balloon (d) sugar
39. 39.⚖️ 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 sugar (b) the same bottles (c) the water temperature (d) the amount of water
40. 40.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed

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