Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 844 · 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.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
2. 2.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
3. 3.⚖️ 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 water (c) the amount of yeast (d) size of the balloon
4. 4.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a small bottle (d) a mirror
6. 6.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to colour it (d) to make it heavy
7. 7.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a battery cell (c) turmeric powder (d) a magnet
8. 8.True or false: warm water is something yeast needs. (a) False (b) True
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a comb (d) sugar
10. 10.⚖️ 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 measure it (c) we change it
11. 11.⚖️ 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) the amount of yeast (c) the amount of water (d) the water temperature
12. 12.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) sugar (d) a comb
14. 14.True or false: sunlight is something yeast needs. (a) True (b) False
15. 15.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
16. 16.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) sugar (c) a battery cell (d) a magnet
18. 18.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) sunlight (d) vinegar
19. 19.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
20. 20.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
22. 22.🍞 Which of these is something yeast needs? (a) warm water (b) sunlight (c) salt (d) vinegar
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a small bottle (c) sugar (d) dry yeast
24. 24.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
26. 26.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
27. 27.True or false: time is something yeast does not need. (a) True (b) False
28. 28.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of stone (d) a kind of salt
29. 29.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) throw it at a wall (d) put it in your mouth
30. 30.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it turns yellow (d) it grows much faster
31. 31.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) vinegar (d) time
32. 32.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) time (d) sunlight
33. 33.🔍 Which is the odd one out? (a) time (b) vinegar (c) a magnet (d) sunlight
34. 34.🍞 Which of these is something yeast does not need? (a) time (b) a magnet (c) warm water (d) sugar
35. 35.⚖️ 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 change it (b) we measure it (c) we keep it the same
36. 36.🔍 Which is the odd one out? (a) sugar (b) warm water (c) vinegar (d) time
37. 37.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) steam (d) carbon dioxide gas
38. 38.⚖️ 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
39. 39.⚖️ 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 measure it (b) we change it (c) we keep it the same
40. 40.True or false: vinegar is something yeast needs. (a) False (b) True

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