Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 156 · 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: salt is something yeast does not need. (a) True (b) False
2. 2.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
3. 3.⚖️ 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
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) warm water (d) a comb
5. 5.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) vinegar
6. 6.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
7. 7.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
8. 8.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold kills sugar (d) cold makes it pink
9. 9.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) sugar (d) a mirror
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a small bottle (d) a battery cell
13. 13.⚖️ 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
14. 14.⚖️ 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
15. 15.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
16. 16.⚖️ 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 sugar (c) the water temperature (d) the same bottles
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we keep it the same (b) we measure it (c) we change it
18. 18.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) time (b) a magnet (c) warm water (d) sugar
20. 20.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
21. 21.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
22. 22.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
23. 23.🔮 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
24. 24.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) a balloon (d) a magnet
26. 26.🍞 Does yeast need salt 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) warm water (b) sugar (c) a mirror (d) a small bottle
28. 28.⚖️ 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) the same bottles (c) size of the balloon
29. 29.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) sugar (d) a paper clip
31. 31.True or false: warm water is something yeast does not need. (a) False (b) True
32. 32.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) vinegar (d) warm water
33. 33.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) salt (d) time
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) warm water (c) a small bottle (d) sugar
35. 35.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) to make it sweet (d) it is food for yeast
36. 36.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
37. 37.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) a magnet (d) warm water
38. 38.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) sunlight
40. 40.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) salt (d) sugar

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