Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 128 · 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.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of yeast (c) the amount of sugar (d) size of the balloon
2. 2.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it bursts at once (d) it turns yellow
3. 3.⚖️ 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) False (b) True
4. 4.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
5. 5.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) keep it for a month (d) put it in your mouth
6. 6.🔮 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
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) a magnet (d) a small bottle
8. 8.🔍 Which is the odd one out? (a) salt (b) warm water (c) time (d) sugar
9. 9.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) a magnet
10. 10.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
11. 11.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
12. 12.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
13. 13.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.True or false: vinegar is something yeast needs. (a) False (b) True
15. 15.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
16. 16.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
17. 17.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a comb (c) a battery cell (d) a magnet
18. 18.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
19. 19.⚖️ 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 change it (b) we keep it the same (c) we measure it
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) sugar (d) a mirror
21. 21.🔍 Which is the odd one out? (a) salt (b) a magnet (c) vinegar (d) sugar
22. 22.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) dry yeast (d) a paper clip
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
24. 24.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) a magnet (d) warm water
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) warm water (d) time
27. 27.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.⚖️ 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
29. 29.🍞 Which of these is something yeast does not need? (a) warm water (b) sunlight (c) time (d) sugar
30. 30.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
31. 31.⚖️ 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 change it (c) we measure it
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a balloon (d) a comb
34. 34.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
35. 35.⚖️ 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 change it (b) we keep it the same (c) we measure it
36. 36.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to make it sweet (d) to colour it
37. 37.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a battery cell (d) a small bottle
39. 39.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to colour rice (d) to clean floors
40. 40.🔍 Which is the odd one out? (a) salt (b) sunlight (c) a magnet (d) time

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