Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 196 · 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.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
2. 2.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
3. 3.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) time (d) sunlight
4. 4.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) salt (d) a magnet
5. 5.🔍 Which is the odd one out? (a) time (b) a magnet (c) sugar (d) warm water
6. 6.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
7. 7.🧺 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) a balloon
8. 8.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to make bread rise (d) to colour rice
9. 9.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
10. 10.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.⚖️ 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 change it (b) we keep it the same (c) we measure it
12. 12.True or false: salt is something yeast does not need. (a) False (b) True
13. 13.⚖️ 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
14. 14.True or false: sunlight is something yeast needs. (a) True (b) False
15. 15.⚖️ 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 sugar (c) the amount of water (d) the amount of yeast
16. 16.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) a small bottle (d) a paper clip
18. 18.🧺 Do we need a battery cell 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 glows (b) it grows faster (c) the yeast is killed (d) it turns to sugar
20. 20.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a comb (c) a magnet (d) a mirror
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a mirror (c) a small bottle (d) dry yeast
22. 22.⚖️ 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) size of the balloon (c) the water temperature
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 water (b) the water temperature (c) the amount of yeast (d) the same bottles
24. 24.⚖️ 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 measure it (b) we change it (c) we keep it the same
25. 25.⚖️ 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) the amount of yeast (c) size of the balloon
26. 26.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold slows yeast down (d) cold makes it pink
27. 27.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
28. 28.⚖️ 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
29. 29.🍞 Which of these is something yeast needs? (a) vinegar (b) sugar (c) a magnet (d) salt
30. 30.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
31. 31.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) salt (d) sunlight
32. 32.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
33. 33.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a small bottle (d) turmeric powder
35. 35.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of stone (d) a kind of salt
36. 36.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
37. 37.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
38. 38.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) vinegar
39. 39.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) a magnet (d) sugar
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) a paper clip (d) dry yeast

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