Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 201 · 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) ice cold (b) boiling hot (c) warm, not hot (d) very salty
2. 2.🍞 Which of these is something yeast does not need? (a) a magnet (b) time (c) warm water (d) sugar
3. 3.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it turns yellow (d) it grows very little
4. 4.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
5. 5.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
6. 6.🔍 Which is the odd one out? (a) salt (b) warm water (c) vinegar (d) a magnet
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) dry yeast (d) turmeric powder
8. 8.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) vinegar
9. 9.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it turns to bread (d) it shrinks to nothing
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a comb (c) a battery cell (d) sugar
11. 11.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) salt (d) sunlight
12. 12.True or false: time is something yeast does not need. (a) True (b) False
13. 13.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it glows (d) it grows faster
14. 14.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
16. 16.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
17. 17.⚖️ 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 change it (c) we keep it the same
18. 18.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) warm water (d) a magnet
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) True (b) False
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of sugar (c) the amount of water (d) size of the balloon
21. 21.⚖️ 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
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 change it (b) we measure it (c) we keep it the same
23. 23.True or false: vinegar is something yeast does not need. (a) False (b) True
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a comb (d) a small bottle
25. 25.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) False (b) True
27. 27.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a comb (d) a small bottle
29. 29.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) warm water (d) time
30. 30.True or false: warm water is something yeast needs. (a) False (b) True
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a mirror (d) a small bottle
32. 32.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a magnet (c) warm water (d) a small bottle
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) warm water (d) a paper clip
35. 35.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
36. 36.⚖️ 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 keep it the same (b) we measure it (c) we change it
37. 37.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) sunlight
38. 38.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) sugar (d) time
39. 39.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
40. 40.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed

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