Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 873 · 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.True or false: warm water is something yeast needs. (a) True (b) False
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) warm water (d) a magnet
3. 3.⚖️ 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
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a mirror (d) warm water
5. 5.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
6. 6.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
7. 7.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold water is heavy (d) cold slows yeast down
8. 8.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the water temperature (c) the amount of yeast (d) size of the balloon
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) dry yeast (c) a balloon (d) sugar
11. 11.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) it glows (d) the yeast is killed
12. 12.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) warm water (d) sunlight
14. 14.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
15. 15.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
16. 16.⚖️ 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
17. 17.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
18. 18.🔍 Which is the odd one out? (a) vinegar (b) salt (c) a magnet (d) sugar
19. 19.True or false: salt is something yeast does not need. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) time (d) salt
21. 21.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it sweet (d) to make it heavy
22. 22.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
23. 23.⚖️ 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) True (b) False
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a balloon (d) a paper clip
25. 25.⚖️ 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
26. 26.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
27. 27.⚖️ 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 same bottles
28. 28.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
29. 29.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) a balloon (d) a mirror
30. 30.True or false: salt is something yeast needs. (a) False (b) True
31. 31.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) vinegar
32. 32.⚖️ 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) False (b) True
33. 33.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) very salty (d) boiling hot
34. 34.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) carbon dioxide gas (d) smoke
35. 35.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
36. 36.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) salt (d) sugar
37. 37.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
38. 38.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
40. 40.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it

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