Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 61 · 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 (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
2. 2.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
3. 3.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a magnet (d) a small bottle
5. 5.True or false: vinegar is something yeast needs. (a) True (b) False
6. 6.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to make it heavy (d) to colour it
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) the amount of yeast (b) size of the balloon (c) the amount of sugar (d) the amount of water
8. 8.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) ice cold (d) boiling hot
9. 9.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
10. 10.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
11. 11.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
12. 12.🔍 Which is the odd one out? (a) time (b) sugar (c) vinegar (d) warm water
13. 13.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
14. 14.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
15. 15.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a kind of stone (d) a tiny living fungus
16. 16.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
17. 17.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
18. 18.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) salt (d) sugar
19. 19.True or false: dry yeast is 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: size of the balloon is the one thing we change. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) a magnet (b) time (c) warm water (d) sugar
22. 22.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
23. 23.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a magnet (c) a mirror (d) turmeric powder
24. 24.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a mirror (d) a small bottle
26. 26.⚖️ 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) the same bottles (c) the amount of water (d) size of the balloon
27. 27.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) a magnet (d) warm water
28. 28.⚖️ 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 yeast
29. 29.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) sugar (d) a magnet
30. 30.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) sunlight (d) warm water
31. 31.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) sugar (d) a paper clip
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) sugar (c) a small bottle (d) warm water
34. 34.⚖️ 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
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 measure it (b) we keep it the same (c) we change it
36. 36.⚖️ 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
37. 37.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) warm water (d) time
38. 38.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) vinegar (d) salt
39. 39.⚖️ 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
40. 40.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it

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