Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 894 · 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.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a tiny living fungus (d) a kind of sugar
2. 2.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
3. 3.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) a magnet
4. 4.⚖️ 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
5. 5.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
6. 6.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) sunlight (b) time (c) warm water (d) sugar
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) dry yeast (d) a mirror
9. 9.True or false: sugar is something yeast needs. (a) True (b) False
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a battery cell (c) warm water (d) sugar
11. 11.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) vinegar (d) sugar
12. 12.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
13. 13.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
15. 15.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
16. 16.True or false: warm water is something yeast needs. (a) True (b) False
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of yeast (c) the amount of water (d) size of the balloon
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 sugar”? (a) we keep it the same (b) we measure it (c) we change it
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) warm water (c) dry yeast (d) a small bottle
20. 20.⚖️ 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
21. 21.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
22. 22.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) ice cold (d) warm, not hot
23. 23.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) the yeast is killed (d) it turns to sugar
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) False (b) True
26. 26.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) a small bottle (c) a balloon (d) sugar
28. 28.True or false: a magnet is something yeast needs. (a) True (b) False
29. 29.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a mirror (c) a magnet (d) turmeric powder
30. 30.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) salt (d) vinegar
31. 31.⚖️ 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 measure it (b) we keep it the same (c) we change it
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) a small bottle (d) sugar
33. 33.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to colour it (d) to make it heavy
34. 34.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
35. 35.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
37. 37.⚖️ 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 sugar
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? True or false: the same bottles is kept the same. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) salt (b) time (c) a magnet (d) vinegar

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