Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 780 · 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.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a magnet (c) turmeric powder (d) a battery cell
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a comb (d) dry yeast
3. 3.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
5. 5.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
6. 6.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
7. 7.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
8. 8.⚖️ 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 water (b) the water temperature (c) the amount of sugar (d) the amount of yeast
9. 9.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a battery cell (d) sugar
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the water temperature (c) the amount of water (d) the same bottles
12. 12.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) carbon dioxide gas (d) steam
13. 13.True or false: sunlight is something yeast does not need. (a) True (b) False
14. 14.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) salt (d) sugar
15. 15.🔍 Which is the odd one out? (a) salt (b) time (c) a magnet (d) sunlight
16. 16.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
17. 17.⚖️ 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 same bottles
18. 18.⚖️ 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 keep it the same (c) we change it
19. 19.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold slows yeast down (d) cold kills sugar
20. 20.⚖️ 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
21. 21.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
22. 22.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
23. 23.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) a paper clip (d) a balloon
25. 25.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.🔍 Which is the odd one out? (a) salt (b) sunlight (c) vinegar (d) warm water
27. 27.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of stone (d) a kind of sugar
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 keep it the same (b) we measure it (c) we change it
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
31. 31.⚖️ 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
32. 32.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
33. 33.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) it is food for yeast (d) to colour it
34. 34.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
35. 35.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) vinegar (d) sugar
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a battery cell (c) a comb (d) warm water
37. 37.True or false: warm water is something yeast needs. (a) False (b) True
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) False (b) True
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a magnet (d) dry yeast
40. 40.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) time (d) sugar

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