Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 457 · 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 water temperature is the one thing we change. (a) True (b) False
2. 2.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
3. 3.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
4. 4.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
5. 5.⚖️ 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
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a battery cell (c) a balloon (d) dry yeast
7. 7.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
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? What do we do with “the water temperature”? (a) we keep it the same (b) we measure it (c) we change it
10. 10.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
11. 11.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sugar (d) sunlight
12. 12.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
14. 14.True or false: sunlight is something yeast does not need. (a) False (b) True
15. 15.True or false: time is something yeast needs. (a) True (b) False
16. 16.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) salt
17. 17.⚖️ 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
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) a paper clip (d) warm water
19. 19.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to make bread rise (d) to colour rice
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) sugar (d) a paper clip
21. 21.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a magnet (c) a battery cell (d) a paper clip
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a small bottle (c) a balloon (d) sugar
23. 23.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) sunlight
24. 24.⚖️ 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 water
25. 25.🍞 Which of these is something yeast needs? (a) time (b) sunlight (c) salt (d) a magnet
26. 26.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
28. 28.True or false: warm water is needed for the yeast balloon. (a) False (b) True
29. 29.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to make it heavy (d) to colour it
30. 30.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
31. 31.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) steam (d) air from outside
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) dry yeast (d) a balloon
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we change it (b) we measure it (c) we keep it the same
34. 34.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
35. 35.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) pour it down the sink (d) put it in your mouth
36. 36.⚖️ 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) the water temperature (c) size of the balloon
37. 37.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
38. 38.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a magnet (d) dry yeast
40. 40.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False

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