Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 20 · 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: dry yeast is needed for the yeast balloon. (a) False (b) True
2. 2.⚖️ 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 keep it the same (c) we measure it
3. 3.⚖️ 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
4. 4.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a mirror (d) a small bottle
6. 6.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.🍞 Does yeast need time 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 kills sugar (c) cold slows yeast down (d) cold makes it pink
9. 9.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little
10. 10.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a magnet (d) a small bottle
12. 12.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) the yeast is killed (d) it turns to sugar
13. 13.⚖️ 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 keep it the same (b) we change it (c) we measure it
14. 14.⚖️ 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
15. 15.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to colour it (d) to make it heavy
16. 16.🔍 Which is the odd one out? (a) time (b) a magnet (c) salt (d) sunlight
17. 17.⚖️ 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 water temperature (b) the amount of sugar (c) the amount of yeast (d) the amount of water
18. 18.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
19. 19.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) keep it for a month (d) put it in your mouth
20. 20.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
21. 21.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
22. 22.⚖️ 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 keep it the same (b) we change it (c) we measure it
23. 23.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
24. 24.True or false: a comb is needed for the yeast balloon. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) vinegar (d) salt
26. 26.True or false: sunlight is something yeast needs. (a) True (b) False
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a magnet (c) a small bottle (d) dry yeast
28. 28.True or false: sugar is something yeast does not need. (a) True (b) False
29. 29.🍞 Which of these is something yeast does not need? (a) warm water (b) sunlight (c) time (d) sugar
30. 30.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
31. 31.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it turns to bread (d) it shrinks to nothing
32. 32.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a small bottle (d) a paper clip
34. 34.True or false: warm water is something yeast does not need. (a) True (b) False
35. 35.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) size of the balloon (c) the amount of sugar (d) the amount of water
37. 37.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
38. 38.True or false: warm water is something yeast needs. (a) False (b) True
39. 39.⚖️ 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 water temperature (c) the amount of yeast
40. 40.🔍 Which is the odd one out? (a) time (b) sugar (c) a magnet (d) warm water

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