Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 760 · 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.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
2. 2.⚖️ 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) False (b) True
3. 3.⚖️ 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 amount of yeast (b) size of the balloon (c) the amount of sugar (d) the water temperature
4. 4.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
5. 5.⚖️ 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
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) a mirror (d) sugar
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a battery cell (c) a comb (d) dry yeast
8. 8.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) it turns to sugar (d) the yeast is killed
9. 9.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
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 change it (c) we measure it
11. 11.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
12. 12.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) sugar (d) warm water
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) False (b) True
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) turmeric powder (d) dry yeast
15. 15.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
16. 16.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
17. 17.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) vinegar (d) time
18. 18.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) turmeric powder (c) a battery cell (d) a comb
19. 19.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
20. 20.⚖️ 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
21. 21.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
22. 22.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) warm water (d) a magnet
23. 23.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
24. 24.True or false: salt is something yeast does not need. (a) False (b) True
25. 25.True or false: salt is something yeast needs. (a) False (b) True
26. 26.⚖️ 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
27. 27.⚖️ 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
28. 28.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
29. 29.⚖️ 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
30. 30.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) pour it down the sink (d) put it in your mouth
31. 31.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
32. 32.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) steam (d) air from outside
33. 33.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it turns yellow (d) it bursts at once
34. 34.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) a magnet (d) sugar
36. 36.⚖️ 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 sugar
37. 37.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) a small bottle (d) a mirror
39. 39.🍞 Which of these is something yeast does not need? (a) sunlight (b) time (c) sugar (d) warm water
40. 40.True or false: time is something yeast needs. (a) False (b) True

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