Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 909 · 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.⚖️ 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) True (b) False
2. 2.⚖️ 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) the water temperature (c) size of the balloon
3. 3.True or false: warm water is something yeast needs. (a) False (b) True
4. 4.🍞 Which of these is something yeast needs? (a) salt (b) sugar (c) sunlight (d) a magnet
5. 5.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) vinegar
6. 6.True or false: a comb is needed for the yeast balloon. (a) False (b) True
7. 7.🍞 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
8. 8.True or false: sunlight is something yeast needs. (a) True (b) False
9. 9.🛟 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
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) a paper clip (d) sugar
11. 11.⚖️ 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 measure it (b) we keep it the same (c) we change it
12. 12.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
13. 13.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) salt (d) vinegar
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) dry yeast (d) a mirror
16. 16.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
17. 17.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) sunlight
19. 19.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) a balloon (c) dry yeast (d) sugar
22. 22.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
23. 23.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a small bottle (d) a paper clip
25. 25.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
26. 26.True or false: time is something yeast needs. (a) False (b) True
27. 27.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) it is food for yeast (d) to colour it
28. 28.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) a magnet
29. 29.⚖️ 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
30. 30.⚖️ 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
31. 31.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
32. 32.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
33. 33.⚖️ 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 yeast (c) the water temperature (d) size of the balloon
34. 34.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) dry yeast (c) sugar (d) a small bottle
37. 37.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) warm water (c) turmeric powder (d) a magnet
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False

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