Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 294 · 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.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
2. 2.⚖️ 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 amount of yeast (c) the same bottles (d) size of the balloon
3. 3.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
4. 4.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) warm water (d) salt
5. 5.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) to make it heavy (d) it is food for yeast
6. 6.⚖️ 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
7. 7.True or false: warm water is needed for the yeast balloon. (a) True (b) False
8. 8.⚖️ 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 change it (b) we keep it the same (c) we measure it
9. 9.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) time (d) salt
10. 10.⚖️ 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 water temperature (c) the amount of sugar (d) the amount of water
11. 11.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
12. 12.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a paper clip (c) a balloon (d) dry yeast
14. 14.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to make bread rise (d) to clean floors
16. 16.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
17. 17.🛟 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
18. 18.🔍 Which is the odd one out? (a) warm water (b) time (c) vinegar (d) sugar
19. 19.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
20. 20.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) salt (b) time (c) a magnet (d) sunlight
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 what we measure. (a) True (b) False
24. 24.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
25. 25.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it turns yellow (d) it bursts at once
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a battery cell (d) a balloon
27. 27.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
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.⚖️ 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
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 keep it the same (b) we measure it (c) we change it
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) a battery cell (d) dry yeast
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) warm water (c) a balloon (d) sugar
33. 33.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) salt
34. 34.🔍 Which is the odd one out? (a) sugar (b) warm water (c) sunlight (d) time
35. 35.⚖️ 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) True (b) False
36. 36.True or false: a magnet is something yeast needs. (a) False (b) True
37. 37.True or false: time is something yeast does not need. (a) True (b) False
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) dry yeast (d) a comb
39. 39.True or false: sunlight is something yeast needs. (a) True (b) False
40. 40.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it

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