Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 323 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a magnet (d) dry yeast
2. 2.⚖️ 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) True (b) False
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) dry yeast (d) a magnet
4. 4.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) sugar (c) a small bottle (d) a balloon
6. 6.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
7. 7.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) warm water (d) salt
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it bursts at once (d) it grows much faster
9. 9.⚖️ 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 water (b) the water temperature (c) size of the balloon (d) the amount of yeast
10. 10.🛟 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
11. 11.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to colour rice (d) to wash dishes
12. 12.🔍 Which is the odd one out? (a) sunlight (b) time (c) a magnet (d) salt
13. 13.⚖️ 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 water (c) size of the balloon (d) the amount of sugar
14. 14.True or false: a magnet is something yeast needs. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) time (b) salt (c) sugar (d) warm water
16. 16.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to colour it (d) to make it sweet
17. 17.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
18. 18.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
19. 19.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it glows (d) it grows faster
20. 20.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) smoke (d) air from outside
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a mirror (d) a balloon
23. 23.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) a balloon (d) sugar
25. 25.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) ice cold (d) warm, not hot
26. 26.True or false: vinegar is something yeast needs. (a) False (b) True
27. 27.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
28. 28.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) a small bottle (c) sugar (d) a balloon
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) salt (d) a magnet
32. 32.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
33. 33.🔍 Which is the odd one out? (a) time (b) sunlight (c) sugar (d) warm water
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a mirror (d) a balloon
35. 35.⚖️ 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) True (b) False
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? What do we do with “the water temperature”? (a) we change it (b) we keep it the same (c) we measure it
38. 38.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.🍞 Which of these is something yeast needs? (a) a magnet (b) sugar (c) sunlight (d) salt
40. 40.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True

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