Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 170 · 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.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) it is food for yeast (d) to make it sweet
2. 2.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) a paper clip (d) a small bottle
4. 4.🔍 Which is the odd one out? (a) warm water (b) time (c) salt (d) sugar
5. 5.⚖️ 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 measure it (b) we change it (c) we keep it the same
6. 6.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
7. 7.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
8. 8.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sugar (d) a magnet
9. 9.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
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 water”? (a) we change it (b) we measure it (c) we keep it the same
11. 11.⚖️ 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 measure it (c) we change it
12. 12.True or false: time is something yeast needs. (a) True (b) False
13. 13.⚖️ 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 water temperature (c) the amount of water
14. 14.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a mirror (c) turmeric powder (d) a battery cell
15. 15.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
16. 16.⚖️ 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) False (b) True
17. 17.🔮 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
18. 18.True or false: salt is something yeast needs. (a) False (b) True
19. 19.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) warm water (d) sunlight
20. 20.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
21. 21.⚖️ 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 water temperature (b) size of the balloon (c) the amount of water (d) the amount of yeast
22. 22.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of salt (d) a kind of stone
23. 23.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
24. 24.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) sugar (d) time
25. 25.⚖️ 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 change it (b) we measure it (c) we keep it the same
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a magnet (d) a balloon
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a small bottle (d) a paper clip
28. 28.True or false: warm water is something yeast does not need. (a) False (b) True
29. 29.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a mirror (c) a paper clip (d) a magnet
31. 31.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) False (b) True
33. 33.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) throw it at a wall (d) keep it for a month
34. 34.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) a magnet (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.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
37. 37.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a battery cell (d) a balloon
39. 39.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam

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