Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 340 · 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.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
2. 2.True or false: vinegar is something yeast needs. (a) False (b) True
3. 3.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) a small bottle (c) warm water (d) sugar
5. 5.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) salt
6. 6.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
7. 7.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) warm water (d) sunlight
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a battery cell (c) a mirror (d) a paper clip
10. 10.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a kind of stone (d) a tiny living fungus
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) put it in your mouth (d) throw it at a wall
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.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) True (b) False
14. 14.True or false: a magnet is something yeast needs. (a) True (b) False
15. 15.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) a magnet
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a mirror (c) dry yeast (d) sugar
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) sugar (d) a small bottle
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) True (b) False
19. 19.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
20. 20.⚖️ 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
21. 21.True or false: sunlight is something yeast does not need. (a) False (b) True
22. 22.⚖️ 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
23. 23.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
24. 24.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
25. 25.True or false: sunlight is something yeast needs. (a) True (b) False
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) turmeric powder (d) dry yeast
27. 27.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
28. 28.🍞 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
29. 29.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
30. 30.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a magnet (d) warm water
32. 32.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) warm water (d) turmeric powder
33. 33.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) sugar (d) a magnet
34. 34.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
35. 35.⚖️ 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 water temperature (b) the amount of sugar (c) size of the balloon (d) the amount of yeast
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) a small bottle (d) warm water
37. 37.⚖️ 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
38. 38.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
39. 39.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.⚖️ 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) the amount of yeast (c) size of the balloon

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