Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 524 · 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.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) air from outside (d) steam
2. 2.⚖️ 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
3. 3.True or false: warm water is something yeast needs. (a) False (b) True
4. 4.⚖️ 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 measure it (b) we change it (c) we keep it the same
5. 5.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a magnet (c) a mirror (d) turmeric powder
6. 6.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it heavy (d) to make it sweet
7. 7.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
8. 8.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
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 yeast (b) the water temperature (c) the amount of sugar (d) the amount of water
10. 10.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.True or false: sunlight is something yeast needs. (a) False (b) True
12. 12.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.🔮 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
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
15. 15.True or false: a mirror is not 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 yeast is the one thing we change. (a) False (b) True
17. 17.⚖️ 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 keep it the same (b) we measure it (c) we change it
18. 18.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sunlight (d) time
19. 19.True or false: vinegar is something yeast needs. (a) True (b) False
20. 20.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) throw it at a wall (d) keep it for a month
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) a mirror (d) dry yeast
22. 22.⚖️ 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 keep it the same (b) we change it (c) we measure it
23. 23.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
24. 24.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
26. 26.True or false: salt is something yeast needs. (a) True (b) False
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a battery cell (d) warm water
28. 28.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) salt (d) sugar
29. 29.⚖️ 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
30. 30.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
31. 31.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) time (d) sugar
32. 32.True or false: sugar is needed for the yeast balloon. (a) True (b) False
33. 33.True or false: a mirror 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 same bottles is what we measure. (a) True (b) False
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a mirror (c) warm water (d) a balloon
36. 36.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
37. 37.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
38. 38.⚖️ 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 water (b) the water temperature (c) size of the balloon (d) the same bottles
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a small bottle (c) dry yeast (d) warm water
40. 40.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed

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