Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 416 · 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.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) a magnet (d) time
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) sugar (c) a balloon (d) dry yeast
3. 3.🔮 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
4. 4.True or false: vinegar is something yeast needs. (a) False (b) True
5. 5.True or false: salt is something yeast needs. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) sugar (b) warm water (c) vinegar (d) time
7. 7.True or false: a small bottle 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? Which of these is the one thing we change? (a) the amount of sugar (b) the amount of water (c) the amount of yeast (d) the water temperature
9. 9.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) throw it at a wall (d) put it in your mouth
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a balloon (d) a magnet
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a balloon (d) a paper clip
12. 12.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) turmeric powder (c) a small bottle (d) sugar
13. 13.⚖️ 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 measure it (c) we keep it the same
14. 14.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) a mirror (d) dry yeast
16. 16.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to clean floors (d) to make bread rise
17. 17.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
18. 18.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
19. 19.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) it turns to sugar (d) the yeast is killed
20. 20.⚖️ 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
21. 21.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of yeast (b) the water temperature (c) size of the balloon
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a mirror (c) sugar (d) dry yeast
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) warm water (d) turmeric powder
25. 25.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) salt (d) warm water
26. 26.True or false: warm water is something yeast needs. (a) False (b) True
27. 27.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
28. 28.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it grows much faster (d) it turns yellow
29. 29.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) a magnet
30. 30.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
31. 31.True or false: warm water is needed for the yeast balloon. (a) False (b) True
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) warm water (c) dry yeast (d) a balloon
33. 33.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
34. 34.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) it is food for yeast (d) to make it heavy
35. 35.🔍 Which is the odd one out? (a) time (b) warm water (c) sunlight (d) sugar
36. 36.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) sunlight
37. 37.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.🔍 Which is the odd one out? (a) vinegar (b) salt (c) time (d) a magnet
39. 39.⚖️ 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
40. 40.True or false: sunlight is something yeast needs. (a) False (b) True

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