Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 832 · 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.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
2. 2.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) vinegar
3. 3.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) dry yeast (d) a magnet
5. 5.True or false: salt is something yeast does not need. (a) False (b) True
6. 6.⚖️ 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
7. 7.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of sugar (d) a kind of stone
8. 8.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a paper clip (c) turmeric powder (d) a battery cell
9. 9.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a battery cell (d) sugar
11. 11.🍞 Which of these is something yeast does not need? (a) a magnet (b) sugar (c) warm water (d) time
12. 12.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
14. 14.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) warm water (d) salt
15. 15.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) the balloon is bigger (d) it turns to bread
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) warm water (d) a comb
17. 17.True or false: a magnet is something yeast does not need. (a) False (b) True
18. 18.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
19. 19.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) it glows (d) the yeast is killed
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a magnet (d) a balloon
21. 21.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) time (d) salt
22. 22.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
23. 23.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
25. 25.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) turmeric powder (d) sugar
27. 27.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) sunlight
29. 29.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
31. 31.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
32. 32.True or false: sunlight is something yeast does not need. (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 yeast (b) the same bottles (c) size of the balloon (d) the water temperature
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) turmeric powder (d) sugar
35. 35.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
37. 37.⚖️ 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 same bottles (b) size of the balloon (c) the water temperature (d) the amount of yeast
38. 38.⚖️ 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
39. 39.⚖️ 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 keep it the same (b) we measure it (c) we change it
40. 40.⚖️ 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

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