Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 922 · 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? Which of these is what we measure? (a) the same bottles (b) the water temperature (c) size of the balloon (d) the amount of sugar
2. 2.⚖️ 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 change it (b) we measure it (c) we keep it the same
3. 3.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
4. 4.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) smoke (d) air from outside
5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
6. 6.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of stone (d) a kind of salt
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) warm water (d) a comb
8. 8.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) it turns to sugar (d) the yeast is killed
9. 9.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to wash dishes (d) to make bread rise
10. 10.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
11. 11.🍞 Which of these is something yeast does not need? (a) salt (b) sugar (c) time (d) warm water
12. 12.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a battery cell (c) a balloon (d) a small bottle
13. 13.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
14. 14.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.⚖️ 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 change it (b) we measure it (c) we keep it the same
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) a mirror (d) warm water
17. 17.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
18. 18.🔍 Which is the odd one out? (a) warm water (b) salt (c) sugar (d) time
19. 19.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) a mirror (d) sugar
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) sugar (d) a magnet
21. 21.True or false: sunlight is something yeast needs. (a) True (b) False
22. 22.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
23. 23.⚖️ 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 sugar (b) size of the balloon (c) the amount of yeast (d) the water temperature
24. 24.⚖️ 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
25. 25.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) a paper clip (d) warm water
27. 27.🍞 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
28. 28.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) a magnet (d) sunlight
29. 29.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
30. 30.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
31. 31.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a battery cell (c) a mirror (d) a balloon
32. 32.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.⚖️ 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 same bottles
34. 34.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
35. 35.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
36. 36.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
37. 37.⚖️ 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
38. 38.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
39. 39.⚖️ 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) False (b) True
40. 40.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) dry yeast (d) turmeric powder

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