Yeast Balloon Experiment Worksheet

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

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