Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 914 · 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? What do we do with “size of the balloon”? (a) we keep it the same (b) we measure it (c) we change it
2. 2.🍞 Which of these is something yeast needs? (a) a magnet (b) sugar (c) vinegar (d) sunlight
3. 3.⚖️ 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 keep it the same (b) we measure it (c) we change it
4. 4.⚖️ 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
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a magnet (c) a balloon (d) dry yeast
6. 6.⚖️ 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 water temperature (c) the amount of water
7. 7.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) warm water (d) time
8. 8.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
9. 9.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
10. 10.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) salt
12. 12.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) dry yeast (d) a small bottle
14. 14.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) keep it for a month (d) throw it at a wall
15. 15.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it glows (d) it grows faster
16. 16.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to colour it (d) to make it sweet
17. 17.⚖️ 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 keep it the same (b) we measure it (c) we change it
18. 18.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of sugar (d) a kind of salt
19. 19.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a balloon (c) a mirror (d) a magnet
20. 20.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
21. 21.⚖️ 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
22. 22.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) steam (d) smoke
23. 23.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) a magnet (d) sugar
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (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 the one thing we change. (a) False (b) True
26. 26.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
27. 27.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
28. 28.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
29. 29.True or false: sugar is something yeast needs. (a) True (b) False
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a mirror (d) a small bottle
31. 31.⚖️ 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
32. 32.True or false: sunlight is something yeast does not need. (a) True (b) False
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a paper clip (c) a balloon (d) a small bottle
34. 34.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) sunlight
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) a magnet (d) a balloon
36. 36.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
37. 37.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) the water temperature (c) size of the balloon
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a paper clip (d) sugar

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