Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 224 · 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.🔮 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
2. 2.⚖️ 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
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) warm water (d) a mirror
5. 5.⚖️ 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
6. 6.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
7. 7.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
8. 8.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) to colour it (d) it is food for yeast
9. 9.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a balloon (c) a paper clip (d) sugar
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) keep it for a month (d) put it in your mouth
12. 12.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
13. 13.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) dry yeast (d) a magnet
15. 15.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sunlight (d) warm water
16. 16.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
17. 17.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) vinegar
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) warm water (c) a battery cell (d) turmeric powder
19. 19.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) a balloon (d) a battery cell
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) sugar (c) a balloon (d) dry yeast
23. 23.⚖️ 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
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) a small bottle (d) a comb
25. 25.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) carbon dioxide gas (d) air from outside
26. 26.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
27. 27.⚖️ 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 water
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we keep it the same (b) we measure it (c) we change it
29. 29.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
30. 30.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold kills sugar (c) cold water is heavy (d) cold makes it pink
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) True (b) False
32. 32.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to make bread rise (d) to clean floors
33. 33.🔍 Which is the odd one out? (a) time (b) sugar (c) a magnet (d) warm water
34. 34.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) salt (d) time
35. 35.⚖️ 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) True (b) False
36. 36.🔍 Which is the odd one out? (a) salt (b) a magnet (c) sunlight (d) sugar
37. 37.True or false: sugar is needed for the yeast balloon. (a) False (b) True
38. 38.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
39. 39.⚖️ 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 yeast (c) the amount of sugar (d) the water temperature
40. 40.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it

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