Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 700 · 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) a magnet (b) warm water (c) a balloon (d) dry yeast
2. 2.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of stone (d) a kind of sugar
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) warm water (d) turmeric powder
4. 4.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
5. 5.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
6. 6.True or false: salt is something yeast needs. (a) True (b) False
7. 7.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold makes it pink (d) cold water is heavy
8. 8.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is bigger (d) the balloon is smaller
9. 9.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.🍞 Which of these is something yeast does not need? (a) sunlight (b) warm water (c) time (d) sugar
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) a comb (d) warm water
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) a small bottle (d) a magnet
13. 13.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to clean floors (d) to colour rice
14. 14.⚖️ 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
15. 15.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
16. 16.⚖️ 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
17. 17.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
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 amount of sugar (b) the same bottles (c) the amount of yeast (d) the water temperature
19. 19.True or false: warm water is something yeast does not need. (a) False (b) True
20. 20.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
21. 21.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
22. 22.⚖️ 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 change it (b) we keep it the same (c) we measure it
23. 23.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
24. 24.True or false: vinegar is something yeast does not need. (a) False (b) True
25. 25.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) ice cold (d) boiling hot
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 amount of yeast
27. 27.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it grows much faster (d) it turns yellow
28. 28.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) time (d) sugar
29. 29.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
30. 30.True or false: sugar is something yeast does not need. (a) False (b) True
31. 31.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a comb (c) a battery cell (d) turmeric powder
32. 32.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) a magnet
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a balloon (c) sugar (d) dry yeast
34. 34.⚖️ 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
35. 35.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) a small bottle (d) sugar
37. 37.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) a magnet (d) salt
38. 38.⚖️ 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) False (b) True
39. 39.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.⚖️ 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

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