Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 229 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) warm water (c) sugar (d) dry yeast
2. 2.True or false: sunlight is something yeast needs. (a) True (b) False
3. 3.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
4. 4.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to make bread rise (d) to clean floors
5. 5.🍞 Which of these is something yeast needs? (a) salt (b) warm water (c) sunlight (d) vinegar
6. 6.🔮 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
7. 7.⚖️ 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) size of the balloon (c) the amount of yeast (d) the water temperature
8. 8.🔍 Which is the odd one out? (a) salt (b) sunlight (c) a magnet (d) time
9. 9.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) it turns to bread (d) the balloon is smaller
10. 10.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
12. 12.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False
14. 14.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.🛟 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
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) turmeric powder (c) a balloon (d) dry yeast
17. 17.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
18. 18.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.⚖️ 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 yeast (b) size of the balloon (c) the water temperature
20. 20.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
21. 21.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
22. 22.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) turmeric powder (d) a small bottle
23. 23.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) vinegar (d) a magnet
25. 25.True or false: warm water is needed for the yeast balloon. (a) False (b) True
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a comb (c) warm water (d) a small bottle
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a balloon (d) a paper clip
28. 28.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
29. 29.⚖️ 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 keep it the same (b) we change it (c) we measure it
30. 30.⚖️ 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 measure it (c) we change it
31. 31.True or false: salt is something yeast needs. (a) True (b) False
32. 32.⚖️ 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) False (b) True
33. 33.⚖️ 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) True (b) False
34. 34.🍞 Which of these is something yeast needs? (a) sugar (b) a magnet (c) sunlight (d) salt
35. 35.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
36. 36.⚖️ 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 measure it (b) we change it (c) we keep it the same
37. 37.⚖️ 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 water
38. 38.True or false: a comb is needed for the yeast balloon. (a) True (b) False
39. 39.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
40. 40.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) sunlight (d) warm water

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