Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 119 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) warm water (d) sugar
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) dry yeast (c) warm water (d) sugar
3. 3.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) warm water (d) a magnet
5. 5.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
7. 7.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
8. 8.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
9. 9.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
10. 10.🔍 Which is the odd one out? (a) salt (b) a magnet (c) warm water (d) sunlight
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a magnet (d) a small bottle
12. 12.True or false: time is something yeast does not need. (a) False (b) True
13. 13.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to colour it (d) to make it heavy
14. 14.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a balloon (c) a battery cell (d) a paper clip
15. 15.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
16. 16.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
17. 17.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) the balloon is smaller (d) it turns to bread
18. 18.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it glows (d) it grows faster
19. 19.⚖️ 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
20. 20.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
21. 21.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
22. 22.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) a mirror (d) turmeric powder
23. 23.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
24. 24.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) warm water (d) time
25. 25.⚖️ 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) True (b) False
26. 26.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.⚖️ 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 sugar (b) the water temperature (c) size of the balloon (d) the amount of water
28. 28.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
29. 29.⚖️ 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) False (b) True
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a small bottle (d) turmeric powder
31. 31.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) salt
32. 32.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) a magnet (d) sugar
33. 33.True or false: sugar is something yeast does not need. (a) False (b) True
34. 34.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
35. 35.⚖️ 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 measure it (b) we change it (c) we keep it the same
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) True (b) False
37. 37.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a tiny living fungus (d) a kind of sugar
38. 38.⚖️ 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) size of the balloon (c) the amount of yeast
39. 39.⚖️ 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) False (b) True
40. 40.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) throw it at a wall (d) put it in your mouth

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