Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 65 · 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 same bottles”? (a) we change it (b) we keep it the same (c) we measure it
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) size of the balloon (c) the water temperature
3. 3.⚖️ 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
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a small bottle (d) a magnet
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) True (b) False
6. 6.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
7. 7.⚖️ 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 sugar (b) the amount of yeast (c) the same bottles (d) the water temperature
8. 8.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a battery cell (d) warm water
10. 10.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
11. 11.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to wash dishes (d) to colour rice
12. 12.True or false: warm water is something yeast does not need. (a) False (b) True
13. 13.True or false: warm water is something yeast needs. (a) False (b) True
14. 14.⚖️ 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 change it (c) we keep it the same
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a paper clip (d) sugar
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a balloon (d) turmeric powder
17. 17.True or false: sugar is needed for the yeast balloon. (a) False (b) True
18. 18.⚖️ 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
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a mirror (c) a small bottle (d) warm water
20. 20.🛟 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
21. 21.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
22. 22.True or false: a magnet is something yeast does not need. (a) False (b) True
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) sugar (c) dry yeast (d) a small bottle
24. 24.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a balloon (c) a mirror (d) turmeric powder
26. 26.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
27. 27.🍞 Does yeast need salt 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? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the amount of sugar
29. 29.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) turmeric powder (c) a small bottle (d) a battery cell
30. 30.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) a magnet
31. 31.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) dry yeast (c) a battery cell (d) a magnet
32. 32.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) to make it sweet (d) it is food for yeast
33. 33.True or false: time is something yeast needs. (a) False (b) True
34. 34.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) sugar (d) a magnet
36. 36.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
37. 37.🍞 Which of these is something yeast needs? (a) salt (b) time (c) a magnet (d) vinegar
38. 38.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) sugar (d) vinegar
39. 39.True or false: sunlight is something yeast needs. (a) True (b) False
40. 40.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread

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