Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 389 · 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.⚖️ 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
2. 2.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
3. 3.True or false: time is something yeast needs. (a) False (b) True
4. 4.True or false: warm water is something yeast needs. (a) True (b) False
5. 5.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) dry yeast (d) a mirror
8. 8.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a battery cell (d) a small bottle
9. 9.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) pour it down the sink (d) put it in your mouth
10. 10.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
11. 11.⚖️ 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
12. 12.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a paper clip (c) dry yeast (d) a small bottle
14. 14.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it grows much faster (d) it bursts at once
15. 15.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a small bottle (c) a comb (d) a paper clip
17. 17.🍞 Which of these is something yeast does not need? (a) a magnet (b) sugar (c) time (d) warm water
18. 18.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a balloon (d) a battery cell
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 kept the same. (a) True (b) False
21. 21.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.True or false: sunlight is something yeast does not need. (a) False (b) True
23. 23.⚖️ 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
24. 24.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) time (d) warm water
25. 25.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
27. 27.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it sweet (d) to make it heavy
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a balloon (d) a magnet
29. 29.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the amount of yeast
31. 31.⚖️ 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
32. 32.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) turmeric powder (c) a battery cell (d) a paper clip
33. 33.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
34. 34.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
35. 35.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
37. 37.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to colour rice (d) to clean floors
38. 38.True or false: salt is something yeast needs. (a) True (b) False
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) True (b) False
40. 40.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False

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