Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 889 · 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 kept the same? (a) the amount of sugar (b) the water temperature (c) size of the balloon
2. 2.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a small bottle (c) a comb (d) a battery cell
4. 4.🔍 Which is the odd one out? (a) salt (b) a magnet (c) time (d) sunlight
5. 5.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
7. 7.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
8. 8.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) the balloon is smaller (d) it shrinks to nothing
9. 9.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) a small bottle (c) sugar (d) dry yeast
10. 10.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) time (d) sugar
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) pour it down the sink (d) throw it at a wall
12. 12.True or false: sunlight is something yeast does not need. (a) True (b) False
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a balloon (d) a magnet
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a magnet (d) dry yeast
15. 15.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
16. 16.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a mirror (d) warm water
18. 18.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it heavy (d) to make it sweet
19. 19.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) True (b) False
21. 21.True or false: sunlight is something yeast needs. (a) True (b) False
22. 22.⚖️ 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) size of the balloon (c) the same bottles (d) the amount of water
23. 23.⚖️ 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
24. 24.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) carbon dioxide gas (d) smoke
25. 25.⚖️ 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
26. 26.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) a comb (d) a small bottle
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) turmeric powder (c) warm water (d) a small bottle
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we measure it (b) we keep it the same (c) we change it
31. 31.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
32. 32.True or false: warm water is something yeast does not need. (a) True (b) False
33. 33.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) salt (d) warm water
34. 34.⚖️ 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
35. 35.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.⚖️ 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 keep it the same (c) we measure it
37. 37.⚖️ 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
38. 38.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) salt (d) time
39. 39.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) vinegar

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