Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 723 · 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.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
2. 2.⚖️ 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 measure it (b) we keep it the same (c) we change it
3. 3.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) the balloon is bigger (d) it turns to bread
4. 4.🍞 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
5. 5.True or false: a comb is needed for the yeast balloon. (a) False (b) True
6. 6.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a small bottle (d) a comb
8. 8.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) a small bottle (c) sugar (d) warm water
9. 9.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) pour it down the sink (d) throw it at a wall
10. 10.True or false: sunlight is something yeast does not need. (a) False (b) True
11. 11.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) salt (d) sugar
12. 12.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) a magnet (d) sugar
13. 13.⚖️ 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
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of yeast (c) size of the balloon (d) the same bottles
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a battery cell (c) a small bottle (d) warm water
16. 16.🔍 Which is the odd one out? (a) salt (b) vinegar (c) warm water (d) a magnet
17. 17.⚖️ 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) size of the balloon (b) the water temperature (c) the amount of yeast (d) the same bottles
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) a comb (d) dry yeast
19. 19.⚖️ 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 measure it (c) we keep it the same
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) False (b) True
21. 21.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
22. 22.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
23. 23.🔮 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
24. 24.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
25. 25.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
26. 26.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
27. 27.True or false: sugar is something yeast does not need. (a) False (b) True
28. 28.True or false: vinegar is something yeast does not need. (a) True (b) False
29. 29.⚖️ 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 change it (b) we keep it the same (c) we measure it
30. 30.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) salt
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
32. 32.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
33. 33.True or false: sugar is something yeast needs. (a) False (b) True
34. 34.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold slows yeast down (d) cold kills sugar
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 needs? (a) vinegar (b) time (c) sunlight (d) a magnet
37. 37.⚖️ 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) True (b) False
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) False (b) True
39. 39.⚖️ 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
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) sugar (d) warm water

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