Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 605 · 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 vinegar to make gas? (a) yeast needs it (b) yeast does not need it
2. 2.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
3. 3.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it grows much faster (d) it bursts at once
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) True (b) False
5. 5.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
6. 6.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) False (b) True
8. 8.⚖️ 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
9. 9.⚖️ 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
10. 10.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
12. 12.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
13. 13.True or false: sunlight is something yeast does not need. (a) True (b) False
14. 14.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
15. 15.⚖️ 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
16. 16.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) turmeric powder (c) dry yeast (d) sugar
18. 18.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) a magnet (d) salt
19. 19.⚖️ 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 amount of yeast (c) the same bottles (d) the amount of water
20. 20.True or false: salt is something yeast needs. (a) False (b) True
21. 21.True or false: warm water is something yeast needs. (a) False (b) True
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a magnet (d) a small bottle
23. 23.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) a small bottle (d) a magnet
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of sugar (b) the water temperature (c) size of the balloon
25. 25.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
26. 26.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a small bottle (c) sugar (d) dry yeast
28. 28.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) sunlight (d) warm water
29. 29.🍞 Which of these is something yeast needs? (a) time (b) a magnet (c) salt (d) sunlight
30. 30.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
31. 31.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) size of the balloon (c) the water temperature
33. 33.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
34. 34.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) a magnet
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) turmeric powder (d) a small bottle
36. 36.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to clean floors (d) to wash dishes
37. 37.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a magnet (c) a paper clip (d) a balloon
38. 38.⚖️ 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 measure it (c) we change it
39. 39.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a paper clip (d) a balloon

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