Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 250 · 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.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
2. 2.True or false: time is something yeast does not need. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) a magnet (b) salt (c) vinegar (d) time
4. 4.True or false: a magnet is something yeast does not need. (a) True (b) False
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a battery cell (c) sugar (d) dry yeast
6. 6.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) sunlight (d) time
7. 7.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
8. 8.🛟 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
9. 9.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) the balloon is smaller (d) it shrinks to nothing
10. 10.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to wash dishes (d) to make bread rise
11. 11.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold slows yeast down (d) cold kills sugar
12. 12.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
13. 13.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
14. 14.⚖️ 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 sugar (b) size of the balloon (c) the water temperature
15. 15.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
16. 16.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) salt (d) sugar
17. 17.🔮 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 grows faster (d) it glows
18. 18.True or false: salt is something yeast does not need. (a) True (b) False
19. 19.⚖️ 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 change it (b) we measure it (c) we keep it the same
20. 20.⚖️ 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
21. 21.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
23. 23.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) salt
24. 24.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a magnet (c) warm water (d) dry yeast
26. 26.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.🔍 Which is the odd one out? (a) time (b) sugar (c) a magnet (d) warm water
28. 28.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) to make it sweet (d) it is food for yeast
29. 29.🔮 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
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) dry yeast (c) a balloon (d) warm water
31. 31.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a comb (d) warm water
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) warm water (c) sugar (d) dry yeast
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
35. 35.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
36. 36.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
37. 37.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) a balloon (c) dry yeast (d) a small bottle
39. 39.⚖️ 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 yeast (c) the amount of sugar (d) the water temperature
40. 40.⚖️ 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

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