Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 500 · 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.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
2. 2.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of sugar (d) a kind of stone
3. 3.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
4. 4.⚖️ 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) False (b) True
5. 5.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) vinegar (d) sugar
6. 6.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
7. 7.🔍 Which is the odd one out? (a) sugar (b) time (c) a magnet (d) warm water
8. 8.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) warm water (d) salt
9. 9.True or false: sugar is something yeast does not need. (a) True (b) False
10. 10.⚖️ 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
11. 11.True or false: vinegar is something yeast needs. (a) False (b) True
12. 12.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) salt (d) sugar
13. 13.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
14. 14.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it turns yellow (d) it grows much faster
15. 15.True or false: salt is something yeast needs. (a) True (b) False
16. 16.⚖️ 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 amount of sugar (c) the same bottles (d) size of the balloon
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 change it (b) we measure it (c) we keep it the same
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a mirror (c) sugar (d) turmeric powder
19. 19.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
22. 22.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
23. 23.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to clean floors (d) to make bread rise
24. 24.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
25. 25.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a small bottle (d) a mirror
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) turmeric powder (d) sugar
28. 28.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) sugar (d) salt
29. 29.⚖️ 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 change it (b) we measure it (c) we keep it the same
30. 30.True or false: warm water is needed for the yeast balloon. (a) False (b) True
31. 31.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) vinegar (d) warm water
32. 32.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.🍞 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
34. 34.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is bigger (d) the balloon is smaller
35. 35.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
36. 36.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
37. 37.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
38. 38.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a small bottle (c) a magnet (d) a battery cell
39. 39.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a comb (c) a small bottle (d) a balloon

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