Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 735 · 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? Which of these is kept the same? (a) size of the balloon (b) the amount of water (c) the water temperature
2. 2.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a mirror (c) warm water (d) a balloon
4. 4.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) sunlight
5. 5.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) time (d) a magnet
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a balloon (d) a magnet
7. 7.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) a magnet (d) sugar
8. 8.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
9. 9.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
10. 10.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) salt (d) sugar
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a comb (d) dry yeast
12. 12.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
13. 13.True or false: vinegar is something yeast needs. (a) False (b) True
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a magnet (d) a small bottle
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a battery cell (d) a small bottle
16. 16.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
17. 17.True or false: sugar is needed for the yeast balloon. (a) False (b) True
18. 18.🍞 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
19. 19.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
20. 20.⚖️ 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 water (c) the water temperature (d) the amount of yeast
21. 21.True or false: time is something yeast does not need. (a) False (b) True
22. 22.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
23. 23.⚖️ 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) False (b) True
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) sugar (d) turmeric powder
25. 25.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it grows faster (d) it glows
26. 26.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) time (d) sugar
27. 27.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.⚖️ 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
29. 29.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
30. 30.🔮 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
31. 31.⚖️ 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 same bottles (b) the amount of water (c) size of the balloon (d) the water temperature
32. 32.⚖️ 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
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) a mirror (d) dry yeast
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the amount of sugar (c) size of the balloon
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) warm water (c) a balloon (d) sugar
36. 36.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) throw it at a wall (d) keep it for a month
37. 37.True or false: warm water is something yeast needs. (a) False (b) True
38. 38.⚖️ 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 same bottles
39. 39.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) warm water (d) time
40. 40.True or false: a magnet is something yeast needs. (a) True (b) False

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