Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 284 · 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 not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) a balloon (d) a comb
2. 2.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
3. 3.⚖️ 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 measure it (b) we keep it the same (c) we change it
4. 4.⚖️ 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 amount of water (c) the amount of yeast (d) the water temperature
5. 5.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
6. 6.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) vinegar
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a balloon (c) a magnet (d) a comb
8. 8.⚖️ 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) the amount of sugar (c) size of the balloon
9. 9.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.True or false: sugar is needed for the yeast balloon. (a) True (b) False
11. 11.True or false: a comb is needed for the yeast balloon. (a) True (b) False
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) a balloon (d) sugar
13. 13.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
14. 14.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it glows (d) it turns to sugar
15. 15.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a tiny living fungus (d) a kind of salt
16. 16.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
17. 17.True or false: warm water is needed for the yeast balloon. (a) False (b) True
18. 18.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
19. 19.🔍 Which is the odd one out? (a) salt (b) sunlight (c) sugar (d) vinegar
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) a balloon (d) turmeric powder
21. 21.⚖️ 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 same bottles (b) the amount of water (c) the amount of yeast (d) the water temperature
22. 22.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a paper clip (c) a balloon (d) dry yeast
24. 24.🍞 Which of these is something yeast needs? (a) time (b) vinegar (c) sunlight (d) salt
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) warm water (d) a magnet
26. 26.⚖️ 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
27. 27.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) salt (d) sunlight
28. 28.⚖️ 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 change it (b) we keep it the same (c) we measure it
29. 29.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to colour rice (d) to make bread rise
30. 30.True or false: time is something yeast needs. (a) True (b) False
31. 31.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
32. 32.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
33. 33.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
34. 34.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) it is food for yeast (d) to make it sweet
35. 35.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
36. 36.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
37. 37.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
38. 38.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
39. 39.⚖️ 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 measure it (b) we change it (c) we keep it the same
40. 40.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) a magnet

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