Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 185 · 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: dry yeast is not needed for the yeast balloon. (a) False (b) True
2. 2.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to clean floors (d) to colour rice
3. 3.🍞 Which of these is something yeast does not need? (a) vinegar (b) warm water (c) sugar (d) time
4. 4.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
5. 5.⚖️ 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 measure it (b) we keep it the same (c) we change it
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) warm water (d) a magnet
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a magnet (d) sugar
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
9. 9.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) sugar (d) vinegar
10. 10.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to make it sweet (d) to colour it
11. 11.⚖️ 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 sugar (b) the amount of yeast (c) the amount of water (d) the water temperature
12. 12.⚖️ 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 change it (b) we keep it the same (c) we measure it
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 sugar”? (a) we keep it the same (b) we change it (c) we measure it
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) a small bottle (d) a magnet
15. 15.⚖️ 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
16. 16.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
17. 17.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) salt (d) time
18. 18.⚖️ 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 change it (b) we keep it the same (c) we measure it
19. 19.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) salt (d) sugar
20. 20.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) very salty (d) boiling hot
21. 21.True or false: time is something yeast does not need. (a) True (b) False
22. 22.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) a magnet (d) sugar
23. 23.⚖️ 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
24. 24.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) throw it at a wall (d) put it in your mouth
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a paper clip (d) a balloon
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) sugar (c) dry yeast (d) a small bottle
27. 27.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
28. 28.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) salt
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a comb (c) warm water (d) a small bottle
30. 30.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
31. 31.🔮 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
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) warm water (d) a small bottle
33. 33.True or false: a magnet is something yeast needs. (a) True (b) False
34. 34.⚖️ 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
35. 35.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold kills sugar (d) cold water is heavy
36. 36.⚖️ 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 change it (b) we measure it (c) we keep it the same
37. 37.True or false: salt is something yeast needs. (a) True (b) False
38. 38.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
39. 39.True or false: vinegar is something yeast needs. (a) False (b) True
40. 40.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it

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