Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 965 · 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.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows very little (d) it grows much faster
2. 2.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
3. 3.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) True (b) False
5. 5.⚖️ 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
6. 6.⚖️ 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) the same bottles (c) the water temperature (d) the amount of water
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) dry yeast (d) turmeric powder
8. 8.🍞 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
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a small bottle (c) a mirror (d) turmeric powder
10. 10.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to make bread rise (d) to clean floors
11. 11.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) sunlight (d) warm water
12. 12.True or false: warm water is something yeast needs. (a) True (b) False
13. 13.⚖️ 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 keep it the same (b) we measure it (c) we change it
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) sugar (d) a comb
15. 15.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) sugar (d) vinegar
16. 16.🔍 Which is the odd one out? (a) salt (b) time (c) sunlight (d) vinegar
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 amount of yeast (b) the amount of sugar (c) the water temperature (d) size of the balloon
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) a balloon (d) a mirror
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) True (b) False
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a balloon (d) a magnet
21. 21.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
22. 22.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sugar (d) sunlight
23. 23.🍞 Which of these is something yeast does not need? (a) salt (b) time (c) sugar (d) warm water
24. 24.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a battery cell (d) warm water
26. 26.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
27. 27.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
28. 28.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) warm water (b) sugar (c) vinegar (d) time
30. 30.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
31. 31.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
32. 32.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold water is heavy (d) cold slows yeast down
33. 33.⚖️ 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
34. 34.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
36. 36.⚖️ 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 keep it the same (c) we measure it
37. 37.True or false: time is something yeast does not need. (a) True (b) False
38. 38.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows
39. 39.⚖️ 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
40. 40.True or false: a magnet is something yeast needs. (a) False (b) True

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