Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 890 · 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) dry yeast (b) sugar (c) turmeric powder (d) a small bottle
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) a small bottle (d) a balloon
3. 3.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
4. 4.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) the yeast is killed (d) it turns to sugar
5. 5.True or false: warm water is needed for the yeast balloon. (a) False (b) True
6. 6.True or false: salt is something yeast needs. (a) False (b) True
7. 7.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
8. 8.⚖️ 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 same bottles (c) the amount of yeast (d) the water temperature
9. 9.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) warm water (c) a balloon (d) sugar
10. 10.🔍 Which is the odd one out? (a) a magnet (b) salt (c) time (d) sunlight
11. 11.True or false: vinegar is something yeast does not need. (a) True (b) False
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) dry yeast (d) a battery cell
13. 13.True or false: a magnet is something yeast needs. (a) True (b) False
14. 14.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) time (d) a magnet
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a comb (c) a mirror (d) a small bottle
16. 16.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) ice cold (d) very salty
17. 17.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
18. 18.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.⚖️ 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
20. 20.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to make it heavy (d) to colour it
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a paper clip (c) dry yeast (d) a small bottle
22. 22.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) a comb (d) warm water
24. 24.⚖️ 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) size of the balloon (c) the same bottles
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a balloon (d) a magnet
26. 26.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
30. 30.⚖️ 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
31. 31.⚖️ 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
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a small bottle (d) turmeric powder
33. 33.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to colour rice (d) to clean floors
34. 34.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
35. 35.🍞 Which of these is something yeast does not need? (a) sugar (b) vinegar (c) warm water (d) time
36. 36.⚖️ 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 same bottles (c) size of the balloon (d) the amount of yeast
37. 37.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
38. 38.True or false: time is something yeast needs. (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 same bottles is kept the same. (a) True (b) False
40. 40.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False

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