Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 667 · 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.🛟 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
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) turmeric powder (d) dry yeast
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a comb (c) a magnet (d) a paper clip
4. 4.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
5. 5.True or false: a magnet is something yeast needs. (a) True (b) False
6. 6.⚖️ 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
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) sugar (c) a balloon (d) a small bottle
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
9. 9.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
10. 10.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) carbon dioxide gas (d) steam
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the amount of yeast (c) size of the balloon
12. 12.True or false: vinegar is something yeast needs. (a) True (b) False
13. 13.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
14. 14.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
15. 15.🔍 Which is the odd one out? (a) warm water (b) sugar (c) sunlight (d) time
16. 16.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
17. 17.⚖️ 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) False (b) True
18. 18.⚖️ 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
19. 19.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
20. 20.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
21. 21.🍞 Which of these is something yeast needs? (a) vinegar (b) time (c) a magnet (d) salt
22. 22.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) vinegar
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 sugar”? (a) we keep it the same (b) we measure it (c) we change it
24. 24.True or false: dry yeast 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? What do we do with “the same bottles”? (a) we measure it (b) we keep it the same (c) we change it
26. 26.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
27. 27.🍞 Which of these is something yeast does not need? (a) salt (b) time (c) sugar (d) warm water
28. 28.⚖️ 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) True (b) False
29. 29.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) a paper clip (d) dry yeast
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
32. 32.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) a balloon (c) dry yeast (d) a small bottle
34. 34.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
36. 36.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) sunlight (d) salt
37. 37.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
38. 38.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) dry yeast (c) sugar (d) a balloon
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a mirror (c) sugar (d) a magnet

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