Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 634 · 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.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to colour rice (d) to clean floors
2. 2.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) time (b) salt (c) warm water (d) sugar
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a battery cell (c) sugar (d) warm water
6. 6.⚖️ 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
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a comb (d) a balloon
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) sugar (c) a small bottle (d) a balloon
9. 9.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
10. 10.⚖️ 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 measure it (c) we keep it the same
11. 11.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
12. 12.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) vinegar (d) sugar
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) carbon dioxide gas (d) air from outside
14. 14.True or false: a magnet is something yeast needs. (a) True (b) False
15. 15.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
16. 16.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) sugar (d) time
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) False (b) True
18. 18.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
19. 19.True or false: salt is something yeast does not need. (a) False (b) True
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a small bottle (c) dry yeast (d) sugar
21. 21.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) put it in your mouth (d) keep it for a month
22. 22.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
23. 23.True or false: warm water is something yeast does not need. (a) False (b) True
24. 24.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
25. 25.True or false: warm water is something yeast needs. (a) False (b) True
26. 26.⚖️ 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) False (b) True
27. 27.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows
28. 28.True or false: time is something yeast does not need. (a) False (b) True
29. 29.⚖️ 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 amount of sugar
30. 30.⚖️ 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 measure it (c) we keep it the same
31. 31.🔍 Which is the odd one out? (a) salt (b) sunlight (c) sugar (d) vinegar
32. 32.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) warm water (d) salt
33. 33.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) salt (d) a magnet
35. 35.🍞 Which of these is something yeast does not need? (a) time (b) vinegar (c) warm water (d) sugar
36. 36.⚖️ 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
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) warm water (c) a small bottle (d) dry yeast
38. 38.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.⚖️ 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 amount of yeast
40. 40.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing

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