Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 543 · 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.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) turmeric powder (c) a battery cell (d) a small bottle
2. 2.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) warm water (d) time
3. 3.⚖️ 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 measure it (b) we keep it the same (c) we change it
4. 4.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) sugar (d) a magnet
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a paper clip (d) dry yeast
7. 7.⚖️ 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) the water temperature (c) size of the balloon
8. 8.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
9. 9.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) salt (d) sugar
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a magnet (c) sugar (d) dry yeast
11. 11.True or false: warm water is something yeast does not need. (a) True (b) False
12. 12.⚖️ 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 sugar
13. 13.True or false: sugar is something yeast needs. (a) False (b) True
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a magnet (d) dry yeast
15. 15.True or false: sugar is something yeast does not need. (a) False (b) True
16. 16.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) throw it at a wall (d) keep it for a month
17. 17.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) a battery cell (d) a balloon
18. 18.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
19. 19.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) it grows faster (d) the yeast is killed
20. 20.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold kills sugar (d) cold makes it pink
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
22. 22.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it bursts at once (d) it grows very little
23. 23.🔍 Which is the odd one out? (a) salt (b) sugar (c) time (d) warm water
24. 24.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
25. 25.True or false: a magnet is something yeast needs. (a) True (b) False
26. 26.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) steam (d) carbon dioxide gas
27. 27.⚖️ 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 measure it (c) we keep it the same
28. 28.True or false: salt is something yeast needs. (a) True (b) False
29. 29.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
30. 30.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) it is food for yeast (d) to make it sweet
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 sugar”? (a) we measure it (b) we keep it the same (c) we change it
32. 32.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
33. 33.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of yeast (b) size of the balloon (c) the water temperature (d) the amount of sugar
35. 35.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) dry yeast (d) a mirror
37. 37.🔍 Which is the odd one out? (a) salt (b) a magnet (c) sunlight (d) sugar
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) sugar (c) a comb (d) a mirror
39. 39.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.⚖️ 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

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