Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 213 · 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? What do we do with “the amount of yeast”? (a) we change it (b) we keep it the same (c) we measure it
2. 2.⚖️ 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 amount of sugar (c) the water temperature
3. 3.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) put it in your mouth (d) pour it down the sink
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) a balloon (c) a small bottle (d) sugar
5. 5.⚖️ 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
6. 6.⚖️ 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 keep it the same (b) we measure it (c) we change it
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a comb (d) sugar
8. 8.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
9. 9.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a mirror (c) a small bottle (d) dry yeast
10. 10.True or false: warm water is needed for the yeast balloon. (a) False (b) True
11. 11.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam
12. 12.True or false: vinegar is something yeast needs. (a) True (b) False
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.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) it is food for yeast (d) to make it sweet
15. 15.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) sunlight
16. 16.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) salt (d) sugar
18. 18.⚖️ 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) size of the balloon (d) the amount of yeast
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a magnet (d) a balloon
20. 20.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
22. 22.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
23. 23.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.⚖️ 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 sugar (b) size of the balloon (c) the amount of water (d) the amount of yeast
25. 25.True or false: sugar is needed for the yeast balloon. (a) True (b) False
26. 26.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
27. 27.⚖️ 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 change it (c) we measure it
28. 28.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold slows yeast down (d) cold water is heavy
29. 29.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
30. 30.⚖️ 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
31. 31.🔍 Which is the odd one out? (a) salt (b) sunlight (c) a magnet (d) sugar
32. 32.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a battery cell (c) a magnet (d) sugar
33. 33.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) vinegar (d) time
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a small bottle (c) a balloon (d) sugar
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) size of the balloon (c) the amount of yeast
36. 36.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) salt (b) warm water (c) sunlight (d) a magnet
38. 38.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a magnet (d) sugar

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