Yeast Balloon Experiment Worksheet

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

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