Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 840 · 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: sunlight is something yeast needs. (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 what we measure? (a) size of the balloon (b) the amount of yeast (c) the water temperature (d) the amount of sugar
3. 3.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) warm water (d) a battery cell
5. 5.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) salt (d) sugar
7. 7.True or false: a magnet is something yeast needs. (a) False (b) True
8. 8.🍞 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
9. 9.⚖️ 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 measure it (b) we change it (c) we keep it the same
10. 10.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of stone (d) a kind of sugar
11. 11.🛟 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
12. 12.⚖️ 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 same bottles (c) the water temperature
13. 13.⚖️ 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
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
15. 15.⚖️ 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
16. 16.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) a magnet
17. 17.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
18. 18.⚖️ 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
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a magnet (c) sugar (d) dry yeast
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) turmeric powder (c) sugar (d) a small bottle
21. 21.⚖️ 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) size of the balloon (c) the amount of sugar (d) the water temperature
22. 22.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to wash dishes (d) to colour rice
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) warm water (d) a magnet
24. 24.🍞 Which of these is something yeast needs? (a) salt (b) sugar (c) a magnet (d) sunlight
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a battery cell (c) dry yeast (d) a small bottle
26. 26.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
27. 27.⚖️ 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 change it (b) we keep it the same (c) we measure it
28. 28.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
29. 29.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
30. 30.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
31. 31.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
32. 32.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) carbon dioxide gas (d) smoke
33. 33.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it bursts at once (d) it grows very little
34. 34.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) turmeric powder (c) a paper clip (d) a magnet
35. 35.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a mirror (d) a balloon
37. 37.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a balloon (d) a comb
39. 39.True or false: vinegar is something yeast does not need. (a) False (b) True
40. 40.True or false: vinegar is something yeast needs. (a) True (b) False

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