Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 851 · 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.⚖️ 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) True (b) False
2. 2.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) sugar (d) salt
3. 3.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) the yeast is killed (d) it grows faster
4. 4.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it bursts at once (d) it grows much faster
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a magnet (c) dry yeast (d) sugar
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a magnet (c) sugar (d) dry yeast
7. 7.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
8. 8.True or false: salt is something yeast needs. (a) True (b) False
9. 9.⚖️ 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
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
11. 11.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
12. 12.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) salt
13. 13.⚖️ 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 keep it the same (b) we measure it (c) we change it
14. 14.True or false: salt 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 the one thing we change? (a) the water temperature (b) the amount of water (c) size of the balloon (d) the amount of sugar
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a comb (c) sugar (d) dry yeast
17. 17.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
18. 18.⚖️ 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
19. 19.🔮 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
20. 20.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
21. 21.⚖️ 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 keep it the same (b) we change it (c) we measure it
22. 22.🔍 Which is the odd one out? (a) a magnet (b) time (c) warm water (d) sugar
23. 23.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
25. 25.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
27. 27.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
28. 28.True or false: sunlight is something yeast does not need. (a) False (b) True
29. 29.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) a magnet (d) sugar
30. 30.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
31. 31.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) keep it for a month (d) throw it at a wall
32. 32.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam
33. 33.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) salt (d) time
34. 34.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
36. 36.🍞 Which of these is something yeast does not need? (a) sunlight (b) time (c) warm water (d) sugar
37. 37.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) warm water (d) vinegar
38. 38.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) salt (d) sunlight
39. 39.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a small bottle (c) a battery cell (d) a mirror

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