Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 78 · 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? True or false: size of the balloon is what we measure. (a) False (b) True
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) sugar (d) dry yeast
3. 3.⚖️ 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
4. 4.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
5. 5.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
6. 6.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing
7. 7.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) warm water (d) turmeric powder
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) dry yeast (d) a mirror
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a battery cell (d) a small bottle
11. 11.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) salt
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a magnet (c) a balloon (d) warm water
14. 14.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.🍞 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
16. 16.⚖️ 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 sugar (b) the amount of yeast (c) size of the balloon (d) the same bottles
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) a small bottle (c) sugar (d) warm water
18. 18.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) ice cold (d) warm, not hot
19. 19.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
20. 20.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
21. 21.True or false: warm water is something yeast does not need. (a) False (b) True
22. 22.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it grows faster (d) it glows
23. 23.True or false: vinegar is something yeast does not need. (a) True (b) False
24. 24.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it grows much faster (d) it turns yellow
25. 25.True or false: a magnet is something yeast needs. (a) False (b) True
26. 26.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
27. 27.⚖️ 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 keep it the same (b) we change it (c) we measure it
28. 28.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
29. 29.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
30. 30.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) sunlight (d) sugar
31. 31.🔍 Which is the odd one out? (a) salt (b) time (c) warm water (d) sugar
32. 32.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold water is heavy (d) cold slows yeast down
33. 33.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
34. 34.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) a magnet (d) warm water
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a balloon (c) sugar (d) dry yeast
36. 36.🍞 Does yeast need time 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? What do we do with “the amount of yeast”? (a) we measure it (b) we change it (c) we keep it the same
38. 38.⚖️ 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) the water temperature (c) size of the balloon (d) the amount of water
39. 39.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) a magnet (d) a small bottle
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) size of the balloon (b) the amount of water (c) the water temperature

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