Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 278 · 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 salt to make gas? (a) yeast needs it (b) yeast does not need it
2. 2.⚖️ 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 yeast (b) size of the balloon (c) the water temperature
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a small bottle (d) turmeric powder
4. 4.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
5. 5.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a small bottle (c) sugar (d) a balloon
7. 7.⚖️ 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 same bottles
8. 8.⚖️ 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
9. 9.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
10. 10.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) it turns to bread (d) the balloon is bigger
11. 11.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we keep it the same (b) we measure it (c) we change it
13. 13.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) time (d) sugar
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a paper clip (d) a small bottle
15. 15.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
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 sugar”? (a) we keep it the same (b) we change it (c) we measure it
17. 17.True or false: sugar is something yeast needs. (a) False (b) True
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) a small bottle (c) warm water (d) sugar
19. 19.🔍 Which is the odd one out? (a) sugar (b) warm water (c) salt (d) time
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) True (b) False
21. 21.🍞 Which of these is something yeast does not need? (a) warm water (b) sunlight (c) sugar (d) time
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) False (b) True
23. 23.True or false: warm water is something yeast does not need. (a) False (b) True
24. 24.⚖️ 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 keep it the same (c) we measure it
25. 25.⚖️ 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 yeast (b) the same bottles (c) the amount of sugar (d) the water temperature
26. 26.🍞 Which of these is something yeast needs? (a) warm water (b) salt (c) sunlight (d) vinegar
27. 27.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) warm water (d) a mirror
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) False (b) True
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a battery cell (d) warm water
30. 30.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
31. 31.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold slows yeast down (d) cold makes it pink
32. 32.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
33. 33.🍞 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
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) sugar (c) a small bottle (d) a balloon
35. 35.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
36. 36.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
37. 37.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
38. 38.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) a comb (d) a small bottle
39. 39.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed

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