Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 790 · 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 battery cell (b) a small bottle (c) sugar (d) warm water
2. 2.⚖️ 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
3. 3.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a balloon (d) a comb
5. 5.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
6. 6.True or false: a comb is needed for the yeast balloon. (a) False (b) True
7. 7.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
8. 8.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) it is food for yeast (d) to make it heavy
9. 9.⚖️ 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 amount of yeast (c) the water temperature (d) the same bottles
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a mirror (d) a small bottle
11. 11.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
12. 12.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
13. 13.🔍 Which is the odd one out? (a) vinegar (b) time (c) warm water (d) sugar
14. 14.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) a comb (d) dry yeast
16. 16.🍞 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
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a balloon (d) a magnet
18. 18.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) dry yeast (d) sugar
20. 20.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) time (d) vinegar
21. 21.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
22. 22.⚖️ 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
23. 23.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sunlight (d) sugar
24. 24.True or false: salt is something yeast does not need. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) salt (b) time (c) sugar (d) warm water
26. 26.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.⚖️ 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 change it (c) we keep it the same
28. 28.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sunlight (d) sugar
29. 29.🍞 Which of these is something yeast needs? (a) salt (b) time (c) sunlight (d) a magnet
30. 30.⚖️ 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 measure it (b) we change it (c) we keep it the same
31. 31.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) sunlight (d) salt
32. 32.True or false: warm water is something yeast does not need. (a) False (b) True
33. 33.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of stone (d) a kind of sugar
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) sugar (d) turmeric powder
35. 35.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
37. 37.⚖️ 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
38. 38.True or false: sunlight is something yeast does not need. (a) False (b) True
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) the same bottles (b) the water temperature (c) size of the balloon
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) sugar (d) a battery cell

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