Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 690 · 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.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) it turns to bread (d) the balloon is smaller
3. 3.⚖️ 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 yeast (b) size of the balloon (c) the water temperature (d) the same bottles
4. 4.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down
7. 7.⚖️ 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 yeast (d) the same bottles
8. 8.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
9. 9.🍞 Which of these is something yeast does not need? (a) time (b) vinegar (c) warm water (d) sugar
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a battery cell (d) warm water
11. 11.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it bursts at once (d) it turns yellow
12. 12.⚖️ 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
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) turmeric powder (c) dry yeast (d) warm water
14. 14.⚖️ 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
15. 15.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) air from outside (d) smoke
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) dry yeast (d) a comb
17. 17.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) salt (d) sugar
18. 18.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
20. 20.True or false: time is something yeast needs. (a) True (b) False
21. 21.True or false: a magnet 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? What do we do with “the amount of yeast”? (a) we measure it (b) we change it (c) we keep it the same
23. 23.⚖️ 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) False (b) True
24. 24.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) vinegar (d) a magnet
25. 25.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) keep it for a month (d) put it in your mouth
27. 27.🔍 Which is the odd one out? (a) time (b) salt (c) sugar (d) warm water
28. 28.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) dry yeast (d) a comb
30. 30.⚖️ 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
31. 31.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
32. 32.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) dry yeast (d) a battery cell
34. 34.⚖️ 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
35. 35.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a magnet (c) sugar (d) a paper clip
36. 36.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to make it heavy (d) to colour it
37. 37.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
38. 38.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) a magnet (d) sugar
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a balloon (c) a magnet (d) dry yeast
40. 40.⚖️ 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

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