Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 626 · 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 is the odd one out? (a) warm water (b) vinegar (c) time (d) sugar
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) sugar (c) a balloon (d) a small bottle
3. 3.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
4. 4.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) turmeric powder (d) sugar
6. 6.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) vinegar (d) warm water
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a magnet (d) sugar
8. 8.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) steam (d) carbon dioxide gas
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a mirror (c) a balloon (d) warm water
10. 10.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False
12. 12.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) salt (b) sugar (c) vinegar (d) a magnet
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) False (b) True
15. 15.⚖️ 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 change it (b) we measure it (c) we keep it the same
16. 16.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
17. 17.⚖️ 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
18. 18.🔍 Which is the odd one out? (a) time (b) salt (c) a magnet (d) vinegar
19. 19.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) salt (d) sugar
21. 21.🔍 Which is the odd one out? (a) salt (b) vinegar (c) warm water (d) a magnet
22. 22.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
23. 23.🧺 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 magnet
24. 24.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) a mirror (d) dry yeast
26. 26.⚖️ 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 amount of sugar (c) the water temperature
27. 27.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) put it in your mouth (d) keep it for a month
28. 28.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
29. 29.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
30. 30.⚖️ 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
31. 31.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold water is heavy (d) cold kills sugar
32. 32.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.True or false: vinegar is something yeast needs. (a) True (b) False
34. 34.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) it is food for yeast (d) to make it sweet
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
36. 36.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
37. 37.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) it shrinks to nothing (d) the balloon is bigger
38. 38.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it turns yellow (d) it bursts at once
39. 39.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
40. 40.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows

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