Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 73 · 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 not needed for the yeast balloon. (a) False (b) True
2. 2.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.True or false: time is something yeast does not need. (a) True (b) False
4. 4.⚖️ 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 water temperature (c) size of the balloon (d) the amount of yeast
5. 5.🔍 Which is the odd one out? (a) sugar (b) warm water (c) sunlight (d) time
6. 6.True or false: warm water is something yeast does not need. (a) False (b) True
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) sugar (c) dry yeast (d) warm water
8. 8.⚖️ 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
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) dry yeast (c) sugar (d) a small bottle
10. 10.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
12. 12.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) sugar (d) time
13. 13.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
14. 14.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
15. 15.True or false: vinegar is something yeast needs. (a) True (b) False
16. 16.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) dry yeast (c) sugar (d) warm water
18. 18.⚖️ 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
19. 19.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
20. 20.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to colour rice (d) to clean floors
21. 21.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
22. 22.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
23. 23.⚖️ 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
24. 24.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
25. 25.⚖️ 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) False (b) True
26. 26.True or false: time is something yeast needs. (a) False (b) True
27. 27.🍞 Which of these is something yeast needs? (a) a magnet (b) sugar (c) salt (d) sunlight
28. 28.🧺 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
29. 29.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
30. 30.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) sugar (c) a small bottle (d) dry yeast
32. 32.True or false: sugar is needed for the yeast balloon. (a) False (b) True
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) False (b) True
34. 34.🔮 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
35. 35.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) salt (d) warm water
36. 36.⚖️ 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) False (b) True
37. 37.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) dry yeast (d) a battery cell
39. 39.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) throw it at a wall (d) put it in your mouth
40. 40.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it bursts at once (d) it grows very little

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