Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 513 · 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.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a paper clip (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.True or false: warm water is something yeast needs. (a) False (b) True
4. 4.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink
5. 5.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
6. 6.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) warm water (d) salt
7. 7.🍞 Which of these is something yeast does not need? (a) time (b) a magnet (c) sugar (d) warm water
8. 8.🔮 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
9. 9.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) to make it sweet (d) it is food for yeast
10. 10.⚖️ 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 amount of water (c) the water temperature (d) the amount of sugar
11. 11.⚖️ 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
12. 12.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
13. 13.⚖️ 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
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False
15. 15.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it turns yellow (d) it bursts at once
16. 16.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a battery cell (d) dry yeast
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) a comb (d) sugar
19. 19.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to colour rice (d) to make bread rise
20. 20.⚖️ 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) False (b) True
21. 21.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) dry yeast (c) a small bottle (d) sugar
23. 23.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
24. 24.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
26. 26.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) sugar (c) a balloon (d) dry yeast
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a comb (d) dry yeast
29. 29.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) a balloon (d) a mirror
30. 30.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
31. 31.🧺 Do we need sugar 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: the amount of water is the one thing we change. (a) True (b) False
33. 33.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) salt (b) a magnet (c) time (d) sunlight
35. 35.True or false: sunlight is something yeast needs. (a) False (b) True
36. 36.True or false: salt is something yeast does not need. (a) True (b) False
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
38. 38.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing
39. 39.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) a small bottle (d) dry yeast

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