Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 921 · 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? Which of these is the one thing we change? (a) the amount of yeast (b) size of the balloon (c) the water temperature (d) the same bottles
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) dry yeast (d) a small bottle
3. 3.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
4. 4.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a mirror (d) a small bottle
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 measure it (b) we change it (c) we keep it the same
7. 7.⚖️ 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
8. 8.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) a balloon (d) sugar
10. 10.🔍 Which is the odd one out? (a) time (b) warm water (c) sunlight (d) sugar
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we change it (b) we measure it (c) we keep it the same
12. 12.⚖️ 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
13. 13.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it grows faster (d) it glows
14. 14.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a balloon (c) a magnet (d) a battery cell
16. 16.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
17. 17.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.True or false: sugar is something yeast does not need. (a) True (b) False
19. 19.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) a magnet (d) sugar
20. 20.True or false: sunlight is something yeast does not need. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) time (b) a magnet (c) sunlight (d) salt
22. 22.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the amount of water (c) size of the balloon (d) the amount of sugar
24. 24.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) vinegar
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) warm water (c) dry yeast (d) a balloon
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) sugar (d) turmeric powder
27. 27.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to colour it (d) to make it heavy
28. 28.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a comb (c) a paper clip (d) a battery cell
29. 29.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
30. 30.True or false: sunlight is something yeast needs. (a) True (b) False
31. 31.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
33. 33.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a magnet (c) a comb (d) a battery cell
34. 34.⚖️ 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 water (c) the water temperature
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
36. 36.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a tiny living fungus (d) a kind of stone
37. 37.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
38. 38.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.⚖️ 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 yeast (c) the water temperature
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) a small bottle (d) a mirror

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