Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 453 · 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) warm water (b) time (c) sugar (d) salt
2. 2.True or false: time is something yeast does not need. (a) True (b) False
3. 3.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) time (d) sugar
4. 4.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
5. 5.⚖️ 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) size of the balloon (c) the water temperature (d) the amount of water
6. 6.⚖️ 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 change it (b) we measure it (c) we keep it the same
7. 7.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
8. 8.True or false: sugar is something yeast needs. (a) False (b) True
9. 9.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
10. 10.True or false: warm water is something yeast needs. (a) True (b) False
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) warm water (c) dry yeast (d) sugar
12. 12.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it turns yellow (d) it grows very little
13. 13.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) dry yeast (d) turmeric powder
14. 14.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to clean floors (d) to colour rice
15. 15.🧺 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
16. 16.🛟 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
17. 17.True or false: salt is something yeast needs. (a) True (b) False
18. 18.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.True or false: time is something yeast needs. (a) False (b) True
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) False (b) True
21. 21.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
22. 22.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) warm water (c) dry yeast (d) sugar
23. 23.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of yeast (c) the same bottles (d) the water temperature
25. 25.⚖️ 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
26. 26.⚖️ 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
27. 27.True or false: salt is something yeast does not need. (a) False (b) True
28. 28.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
29. 29.⚖️ 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 change it (b) we measure it (c) we keep it the same
30. 30.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) time (d) warm water
31. 31.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing
32. 32.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) salt (d) warm water
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a paper clip (c) dry yeast (d) sugar
34. 34.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) turmeric powder (c) a mirror (d) sugar
35. 35.⚖️ 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
36. 36.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
37. 37.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) vinegar
38. 38.⚖️ 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
39. 39.⚖️ 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
40. 40.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it

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