Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 253 · 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) dry yeast (b) a paper clip (c) a small bottle (d) sugar
2. 2.⚖️ 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
3. 3.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
4. 4.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
5. 5.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
6. 6.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.🔍 Which is the odd one out? (a) warm water (b) time (c) salt (d) sugar
8. 8.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) the yeast is killed (d) it grows faster
9. 9.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) warm water (c) a battery cell (d) turmeric powder
11. 11.🍞 Which of these is something yeast does not need? (a) sugar (b) a magnet (c) time (d) warm water
12. 12.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) warm water (d) salt
14. 14.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) ice cold (d) boiling hot
16. 16.🔍 Which is the odd one out? (a) salt (b) sunlight (c) time (d) a magnet
17. 17.⚖️ 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 keep it the same (b) we change it (c) we measure it
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 keep it the same (c) we change it
19. 19.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
20. 20.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sugar (d) a magnet
21. 21.⚖️ 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 change it (b) we measure it (c) we keep it the same
22. 22.🔍 Which is the odd one out? (a) time (b) sugar (c) a magnet (d) warm water
23. 23.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a tiny living fungus (d) a kind of salt
24. 24.⚖️ 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
25. 25.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
27. 27.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
28. 28.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) True (b) False
31. 31.True or false: vinegar is something yeast needs. (a) True (b) False
32. 32.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) salt (d) sugar
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 sugar”? (a) we change it (b) we measure it (c) we keep it the same
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a magnet (c) dry yeast (d) sugar
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a battery cell (c) a small bottle (d) sugar
36. 36.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) sunlight
37. 37.⚖️ 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 amount of water (c) the water temperature
38. 38.True or false: warm water is something yeast does not need. (a) True (b) False
39. 39.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it grows much faster (d) it bursts at once
40. 40.True or false: warm water is needed for the yeast balloon. (a) False (b) True

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