Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 827 · 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: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it grows much faster (d) it turns yellow
2. 2.🔮 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
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we keep it the same (b) we change it (c) we measure it
4. 4.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
5. 5.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) dry yeast (c) a small bottle (d) sugar
7. 7.True or false: a comb is needed for the yeast balloon. (a) False (b) True
8. 8.⚖️ 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
9. 9.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) salt
10. 10.🍞 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
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
12. 12.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
13. 13.⚖️ 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
14. 14.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to make bread rise (d) to clean floors
15. 15.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a tiny living fungus (d) a kind of salt
16. 16.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
17. 17.True or false: time is something yeast needs. (a) False (b) True
18. 18.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
19. 19.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
20. 20.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) ice cold (d) boiling hot
21. 21.⚖️ 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 amount of water (c) the water temperature
22. 22.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
23. 23.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
24. 24.⚖️ 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 change it (c) we keep it the same
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) a magnet (d) sugar
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 sugar (d) the amount of water
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a magnet (d) sugar
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) sugar (d) a small bottle
29. 29.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a mirror (d) a balloon
31. 31.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) a magnet (d) a balloon
32. 32.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
33. 33.⚖️ 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
34. 34.⚖️ 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 water (d) the same bottles
35. 35.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing
36. 36.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) a magnet
37. 37.⚖️ 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 same bottles (c) the water temperature
38. 38.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) sugar (b) warm water (c) vinegar (d) time

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