Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 148 · 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 is the odd one out? (a) a magnet (b) time (c) sugar (d) warm water
2. 2.True or false: time is something yeast does not need. (a) True (b) False
3. 3.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows
4. 4.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) ice cold (d) warm, not hot
5. 5.🔮 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
6. 6.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a paper clip (c) dry yeast (d) sugar
8. 8.⚖️ 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) False (b) True
9. 9.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
10. 10.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we change it (b) we keep it the same (c) we measure it
12. 12.True or false: salt is something yeast does not need. (a) False (b) True
13. 13.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it grows very little (d) it turns yellow
14. 14.⚖️ 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 keep it the same (c) we change it
15. 15.True or false: sugar is something yeast needs. (a) False (b) True
16. 16.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
17. 17.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to colour it (d) to make it sweet
18. 18.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
19. 19.⚖️ 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 measure it (c) we change it
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) a balloon (d) a small bottle
21. 21.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
22. 22.⚖️ 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 measure it (b) we keep it the same (c) we change it
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
24. 24.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a battery cell (d) dry yeast
26. 26.⚖️ 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 yeast (b) the water temperature (c) the amount of water (d) the same bottles
27. 27.🔍 Which is the odd one out? (a) sunlight (b) salt (c) warm water (d) vinegar
28. 28.🍞 Which of these is something yeast needs? (a) warm water (b) salt (c) sunlight (d) vinegar
29. 29.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
30. 30.True or false: vinegar is something yeast does not need. (a) False (b) True
31. 31.True or false: warm water is needed for the yeast balloon. (a) True (b) False
32. 32.⚖️ 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 same bottles (c) the water temperature (d) size of the balloon
33. 33.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) sugar (d) salt
34. 34.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) dry yeast (c) sugar (d) a small bottle
36. 36.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
37. 37.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) salt (d) warm water
38. 38.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) warm water (d) time
39. 39.⚖️ 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
40. 40.🍞 Which of these is something yeast does not need? (a) a magnet (b) sugar (c) warm water (d) time

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