Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 175 · 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.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a mirror (d) a balloon
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) dry yeast (d) a paper clip
4. 4.True or false: a magnet is something yeast does not need. (a) True (b) False
5. 5.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a battery cell (d) a balloon
7. 7.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
8. 8.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to clean floors (d) to colour rice
9. 9.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
11. 11.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
12. 12.True or false: warm water is something yeast does not need. (a) False (b) True
13. 13.⚖️ 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 keep it the same (b) we change it (c) we measure it
14. 14.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
15. 15.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
16. 16.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) throw it at a wall (d) put it in your mouth
17. 17.🔮 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 glows (d) it grows faster
18. 18.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) sunlight
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a balloon (d) a magnet
20. 20.⚖️ 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 water (b) the same bottles (c) size of the balloon (d) the amount of yeast
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
22. 22.⚖️ 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) True (b) False
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) turmeric powder (c) sugar (d) dry yeast
24. 24.⚖️ 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 change it (c) we measure it
25. 25.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
26. 26.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold makes it pink (d) cold kills sugar
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a battery cell (c) dry yeast (d) a balloon
28. 28.True or false: sugar is something yeast does not need. (a) True (b) False
29. 29.⚖️ 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 water temperature (c) the amount of yeast
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) sugar (d) a comb
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 keep it the same (b) we change it (c) we measure it
32. 32.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of sugar (d) a kind of stone
33. 33.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) time (d) sunlight
35. 35.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) sugar (d) a mirror
36. 36.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) sugar (d) turmeric powder
38. 38.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
39. 39.True or false: sunlight is something yeast does not need. (a) False (b) True
40. 40.True or false: time is something yeast needs. (a) False (b) True

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