Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 554 · 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.True or false: warm water is something yeast needs. (a) False (b) True
2. 2.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam
3. 3.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.⚖️ 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
5. 5.True or false: a magnet is something yeast does not need. (a) False (b) True
6. 6.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
9. 9.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) dry yeast (d) a magnet
10. 10.⚖️ 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) size of the balloon (b) the amount of yeast (c) the water temperature (d) the amount of water
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
12. 12.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) True (b) False
14. 14.⚖️ 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 change it (b) we measure it (c) we keep it the same
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False
16. 16.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) the yeast is killed (d) it grows faster
17. 17.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) salt (d) sunlight
18. 18.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
19. 19.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
20. 20.True or false: time is something yeast does not need. (a) True (b) False
21. 21.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
22. 22.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) turmeric powder (d) sugar
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) warm water (d) a comb
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we change it (b) we measure it (c) we keep it the same
25. 25.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) a balloon (d) a mirror
26. 26.⚖️ 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
27. 27.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a small bottle (d) a battery cell
29. 29.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) salt (d) warm water
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a magnet (c) a battery cell (d) a paper clip
31. 31.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) warm water (d) turmeric powder
33. 33.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) to colour it (d) it is food for yeast
34. 34.⚖️ 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
35. 35.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) time (d) sunlight
36. 36.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
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.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
39. 39.🍞 Which of these is something yeast does not need? (a) time (b) sunlight (c) sugar (d) warm water
40. 40.🔍 Which is the odd one out? (a) time (b) warm water (c) vinegar (d) sugar

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