Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 420 · 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 something yeast needs? (a) time (b) vinegar (c) salt (d) sunlight
2. 2.True or false: vinegar is something yeast needs. (a) False (b) True
3. 3.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a battery cell (c) a magnet (d) dry yeast
4. 4.🔍 Which is the odd one out? (a) salt (b) warm water (c) time (d) sugar
5. 5.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) a magnet (d) time
6. 6.True or false: time is something yeast needs. (a) True (b) False
7. 7.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) salt (d) sugar
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) turmeric powder (d) a small bottle
9. 9.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) sugar (d) salt
10. 10.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of stone (d) a kind of sugar
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) a balloon (c) warm water (d) a small bottle
12. 12.⚖️ 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 change it (c) we measure it
13. 13.⚖️ 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
14. 14.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
15. 15.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
16. 16.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) warm water (c) a balloon (d) dry yeast
18. 18.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
19. 19.⚖️ 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) size of the balloon (c) the water temperature
20. 20.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it sweet (d) to make it heavy
21. 21.⚖️ 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 amount of yeast (c) the water temperature
22. 22.⚖️ 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
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
24. 24.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
25. 25.True or false: sugar is something yeast needs. (a) False (b) True
26. 26.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) salt
29. 29.⚖️ 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 sugar (c) the water temperature (d) the same bottles
30. 30.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows
31. 31.True or false: a magnet is something yeast needs. (a) True (b) False
32. 32.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) turmeric powder (c) sugar (d) a comb
33. 33.⚖️ 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
34. 34.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) throw it at a wall (d) put it in your mouth
35. 35.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) a mirror (d) a balloon
38. 38.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
39. 39.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it grows very little (d) it bursts at once
40. 40.⚖️ 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

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