Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 418 · 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) a magnet (b) salt (c) sugar (d) sunlight
2. 2.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
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 amount of sugar (b) size of the balloon (c) the water temperature
4. 4.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a balloon (c) a comb (d) dry yeast
6. 6.True or false: salt is something yeast needs. (a) True (b) False
7. 7.⚖️ 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 keep it the same (b) we change it (c) we measure it
8. 8.🛟 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
9. 9.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
10. 10.⚖️ 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 yeast (c) size of the balloon
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a paper clip (c) a balloon (d) warm water
12. 12.⚖️ 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 keep it the same (b) we change it (c) we measure it
13. 13.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) to make it sweet (d) it is food for yeast
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a balloon (c) a small bottle (d) dry yeast
15. 15.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) sunlight (d) time
16. 16.⚖️ 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
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a battery cell (c) sugar (d) dry yeast
18. 18.🔍 Which is the odd one out? (a) salt (b) sunlight (c) time (d) a magnet
19. 19.True or false: time is something yeast needs. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) salt
21. 21.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) time (d) sugar
23. 23.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
24. 24.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) vinegar (d) warm water
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) dry yeast (d) turmeric powder
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) True (b) False
27. 27.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.⚖️ 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
29. 29.⚖️ 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) False (b) True
30. 30.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of sugar (b) the amount of yeast (c) size of the balloon (d) the amount of water
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a battery cell (d) warm water
33. 33.True or false: sunlight is something yeast does not need. (a) False (b) True
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a small bottle (c) a balloon (d) warm water
35. 35.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.⚖️ 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) the amount of water (c) the amount of yeast (d) size of the balloon
37. 37.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) sugar (d) salt
38. 38.True or false: sugar is something yeast does not need. (a) True (b) False
39. 39.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
40. 40.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True

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