Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 953 · 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.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
2. 2.True or false: time is something yeast does not need. (a) True (b) False
3. 3.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it turns yellow (d) it grows very little
4. 4.⚖️ 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 yeast (b) the same bottles (c) the amount of water (d) the water temperature
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the amount of yeast (c) size of the balloon (d) the water temperature
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) a magnet (d) warm water
7. 7.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
8. 8.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) sugar (d) a mirror
9. 9.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of stone (d) a kind of sugar
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False
12. 12.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a mirror (d) dry yeast
14. 14.⚖️ 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
15. 15.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
17. 17.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) it turns to bread (d) the balloon is smaller
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a magnet (c) a balloon (d) dry yeast
19. 19.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) sunlight (d) time
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) a battery cell (d) dry yeast
21. 21.True or false: sugar is something yeast does not need. (a) True (b) False
22. 22.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
23. 23.⚖️ 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) False (b) True
24. 24.🔍 Which is the odd one out? (a) warm water (b) sugar (c) salt (d) time
25. 25.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) time (d) sugar
26. 26.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) it is food for yeast (d) to make it sweet
27. 27.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
28. 28.🍞 Which of these is something yeast needs? (a) sugar (b) a magnet (c) salt (d) sunlight
29. 29.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
30. 30.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) vinegar
31. 31.⚖️ 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 change it (b) we keep it the same (c) we measure it
32. 32.🔍 Which is the odd one out? (a) warm water (b) sugar (c) vinegar (d) time
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
34. 34.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) throw it at a wall (d) pour it down the sink
35. 35.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
36. 36.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) False (b) True
38. 38.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
39. 39.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
40. 40.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to colour rice (d) to wash dishes

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