Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 56 · 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: a battery cell is not needed for the yeast balloon. (a) True (b) False
2. 2.🛟 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
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) warm water (d) a magnet
4. 4.⚖️ 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) size of the balloon (c) the amount of yeast
5. 5.⚖️ 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
6. 6.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it heavy (d) to make it sweet
7. 7.⚖️ 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 sugar (b) the amount of water (c) the amount of yeast (d) size of the balloon
8. 8.🔮 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
9. 9.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
10. 10.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) carbon dioxide gas (d) air from outside
11. 11.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) a magnet (d) sugar
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a balloon (c) a small bottle (d) warm water
13. 13.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is bigger (d) the balloon is smaller
14. 14.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
15. 15.⚖️ 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) size of the balloon (b) the amount of sugar (c) the water temperature (d) the amount of water
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a balloon (d) a magnet
17. 17.⚖️ 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) False (b) True
18. 18.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
19. 19.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
20. 20.True or false: sunlight is something yeast does not need. (a) True (b) False
21. 21.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
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 sugar”? (a) we measure it (b) we keep it the same (c) we change it
23. 23.True or false: salt is something yeast does not need. (a) True (b) False
24. 24.True or false: a comb is needed for the yeast balloon. (a) False (b) True
25. 25.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
26. 26.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a small bottle (d) a battery cell
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a mirror (c) dry yeast (d) a magnet
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
30. 30.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
31. 31.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
32. 32.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) turmeric powder (c) a small bottle (d) a battery cell
33. 33.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a tiny living fungus (d) a kind of stone
34. 34.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) warm water (d) salt
36. 36.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) a magnet
37. 37.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
39. 39.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to colour rice (d) to clean floors
40. 40.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) vinegar

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