Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 975 · 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) a magnet (b) dry yeast (c) a balloon (d) warm water
2. 2.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a comb (c) turmeric powder (d) a paper clip
4. 4.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
5. 5.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to colour it (d) to make it heavy
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) a mirror (d) sugar
7. 7.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows
8. 8.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
9. 9.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to clean floors (d) to colour rice
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) a balloon (d) a battery cell
11. 11.🍞 Which of these is something yeast does not need? (a) vinegar (b) sugar (c) warm water (d) time
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
13. 13.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) sunlight (d) salt
14. 14.True or false: time is something yeast does not need. (a) True (b) False
15. 15.⚖️ 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 yeast (c) the amount of water (d) the water temperature
16. 16.⚖️ 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 change it (c) we keep it the same
17. 17.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
18. 18.🔍 Which is the odd one out? (a) salt (b) warm water (c) time (d) sugar
19. 19.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) turmeric powder (c) a paper clip (d) warm water
21. 21.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
22. 22.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
24. 24.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
25. 25.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.🛟 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
27. 27.True or false: warm water is something yeast needs. (a) True (b) False
28. 28.⚖️ 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 water (b) the water temperature (c) size of the balloon
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) warm water (d) a mirror
30. 30.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
31. 31.⚖️ 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 change it (c) we measure it
32. 32.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
33. 33.⚖️ 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 yeast (c) the same bottles (d) the water temperature
34. 34.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
35. 35.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the amount of yeast
37. 37.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) salt (d) vinegar
38. 38.True or false: a magnet is something yeast needs. (a) True (b) False
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a paper clip (d) sugar
40. 40.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False

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