Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 335 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) warm water (d) turmeric powder
2. 2.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) sugar (c) warm water (d) dry yeast
4. 4.🔍 Which is the odd one out? (a) time (b) salt (c) sunlight (d) a magnet
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of water (b) size of the balloon (c) the amount of yeast (d) the water temperature
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a paper clip (d) a small bottle
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) warm water (c) dry yeast (d) sugar
8. 8.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) a magnet
9. 9.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to colour rice (d) to clean floors
10. 10.True or false: warm water is something yeast needs. (a) True (b) False
11. 11.⚖️ 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 measure it (c) we keep it the same
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) keep it for a month (d) put it in your mouth
13. 13.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) vinegar (d) warm water
15. 15.True or false: time is something yeast does not need. (a) True (b) False
16. 16.True or false: sugar is needed for the yeast balloon. (a) False (b) True
17. 17.🔮 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
18. 18.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) vinegar (d) salt
19. 19.True or false: warm water is something yeast does not need. (a) True (b) False
20. 20.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
21. 21.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
22. 22.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
23. 23.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
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 water”? (a) we measure it (b) we keep it the same (c) we change it
25. 25.⚖️ 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
26. 26.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) salt (d) warm water
28. 28.⚖️ 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
29. 29.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) salt (d) sugar
30. 30.⚖️ 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 measure it (c) we keep it the same
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) a battery cell (d) sugar
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a small bottle (c) dry yeast (d) a balloon
33. 33.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
34. 34.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold kills sugar (d) cold makes it pink
35. 35.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
36. 36.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
37. 37.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False
39. 39.⚖️ 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 sugar (c) the amount of yeast (d) size of the balloon
40. 40.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) to make it heavy (d) it is food for yeast

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