Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 740 · 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.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a battery cell (d) a balloon
3. 3.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) a magnet
4. 4.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sunlight (d) time
6. 6.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) vinegar
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a magnet (c) sugar (d) warm water
8. 8.⚖️ 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 measure it (b) we keep it the same (c) we change it
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a small bottle (c) turmeric powder (d) a paper clip
10. 10.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) sugar (d) turmeric powder
12. 12.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the water temperature (c) the amount of sugar (d) the same bottles
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) warm water (c) a small bottle (d) a balloon
15. 15.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) a magnet (d) salt
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of yeast (b) size of the balloon (c) the water temperature
17. 17.True or false: a magnet is something yeast needs. (a) True (b) False
18. 18.🔮 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
19. 19.⚖️ 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
20. 20.🔮 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
21. 21.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
22. 22.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) sugar (d) warm water
23. 23.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
24. 24.🍞 Which of these is something yeast needs? (a) vinegar (b) sugar (c) sunlight (d) a magnet
25. 25.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) throw it at a wall (d) keep it for a month
26. 26.🔍 Which is the odd one out? (a) sunlight (b) salt (c) vinegar (d) warm water
27. 27.⚖️ 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 keep it the same (c) we measure it
28. 28.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) to colour it (d) it is food for yeast
29. 29.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
30. 30.⚖️ 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
31. 31.⚖️ 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) True (b) False
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) True (b) False
33. 33.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to clean floors (d) to wash dishes
34. 34.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
37. 37.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) salt
38. 38.⚖️ 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 keep it the same (b) we change it (c) we measure it
39. 39.⚖️ 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
40. 40.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) time (d) sugar

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