Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 403 · 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.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
2. 2.⚖️ 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
3. 3.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) a mirror (d) a balloon
5. 5.⚖️ 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 same bottles
6. 6.True or false: sunlight is something yeast needs. (a) False (b) True
7. 7.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) salt (d) sugar
8. 8.⚖️ 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 amount of yeast (b) the amount of water (c) the water temperature (d) size of the balloon
9. 9.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
10. 10.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
11. 11.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) a magnet (d) salt
12. 12.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) dry yeast (c) a magnet (d) a battery cell
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) dry yeast (c) a balloon (d) a small bottle
14. 14.⚖️ 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
15. 15.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
16. 16.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
17. 17.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sunlight (d) warm water
19. 19.🔍 Which is the odd one out? (a) salt (b) a magnet (c) time (d) sunlight
20. 20.True or false: a magnet is something yeast needs. (a) True (b) False
21. 21.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
22. 22.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
24. 24.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it turns yellow (d) it grows much faster
25. 25.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
26. 26.True or false: sugar is something yeast needs. (a) False (b) True
27. 27.⚖️ 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) True (b) False
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) dry yeast (c) sugar (d) a balloon
29. 29.⚖️ 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
30. 30.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
31. 31.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) vinegar (d) warm water
32. 32.🔮 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
33. 33.⚖️ 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
34. 34.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam
35. 35.🔍 Which is the odd one out? (a) sugar (b) time (c) vinegar (d) warm water
36. 36.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
37. 37.⚖️ 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
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) warm water (d) sugar
39. 39.True or false: sugar is needed for the yeast balloon. (a) False (b) True
40. 40.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of salt (d) a kind of sugar

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