Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 41 · 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 not needed for the yeast balloon? (a) warm water (b) a comb (c) a balloon (d) sugar
2. 2.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) steam (d) carbon dioxide gas
3. 3.True or false: time is something yeast needs. (a) False (b) True
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) dry yeast (d) sugar
5. 5.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) warm water (d) turmeric powder
8. 8.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) time (d) vinegar
9. 9.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) sugar (c) a paper clip (d) a mirror
10. 10.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) warm water (d) time
11. 11.🍞 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
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a magnet (d) warm water
13. 13.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
14. 14.⚖️ 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) False (b) True
15. 15.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
16. 16.⚖️ 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 yeast (d) the same bottles
17. 17.True or false: vinegar is something yeast does not need. (a) False (b) True
18. 18.⚖️ 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 change it (c) we keep it the same
19. 19.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of stone (d) a kind of salt
20. 20.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to make bread rise (d) to wash dishes
21. 21.True or false: vinegar is something yeast needs. (a) True (b) False
22. 22.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
23. 23.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
24. 24.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a paper clip (d) dry yeast
26. 26.⚖️ 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
27. 27.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it grows very little (d) it bursts at once
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a battery cell (c) warm water (d) dry yeast
30. 30.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
31. 31.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
32. 32.⚖️ 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
33. 33.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
34. 34.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold slows yeast down (d) cold water is heavy
35. 35.True or false: warm water is needed for the yeast balloon. (a) False (b) True
36. 36.⚖️ 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 change it (b) we measure it (c) we keep it the same
37. 37.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
38. 38.True or false: warm water is something yeast needs. (a) False (b) True
39. 39.⚖️ 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 change it (c) we keep it the same
40. 40.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) time (d) sugar

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