Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 460 · 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: sunlight is something yeast needs. (a) True (b) False
2. 2.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) sunlight
3. 3.True or false: vinegar is something yeast does not need. (a) True (b) False
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) sugar (d) a magnet
5. 5.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) salt (d) time
6. 6.⚖️ 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) False (b) True
7. 7.⚖️ 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) True (b) False
8. 8.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) turmeric powder (d) dry yeast
9. 9.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.⚖️ 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 measure it (b) we change it (c) we keep it the same
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) sugar (d) a mirror
12. 12.⚖️ 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) False (b) True
13. 13.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it bursts at once (d) it turns yellow
14. 14.⚖️ 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 keep it the same (b) we measure it (c) we change it
15. 15.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
16. 16.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
17. 17.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) a small bottle (c) warm water (d) sugar
19. 19.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
20. 20.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
21. 21.⚖️ 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) size of the balloon (b) the same bottles (c) the amount of water (d) the water temperature
22. 22.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a balloon (c) a magnet (d) a comb
23. 23.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
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 what we measure. (a) False (b) True
26. 26.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) time (d) salt
27. 27.⚖️ 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) True (b) False
28. 28.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) put it in your mouth (d) keep it for a month
29. 29.⚖️ 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 measure it (b) we keep it the same (c) we change it
30. 30.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) it turns to bread (d) the balloon is smaller
31. 31.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) sugar (d) salt
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a magnet (c) warm water (d) dry yeast
33. 33.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
34. 34.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) it is food for yeast (d) to make it sweet
35. 35.🔍 Which is the odd one out? (a) warm water (b) salt (c) time (d) sugar
36. 36.True or false: warm water is something yeast needs. (a) False (b) True
37. 37.⚖️ 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
38. 38.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
39. 39.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to colour rice (d) to clean floors
40. 40.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a tiny living fungus (d) a kind of sugar

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