Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 664 · 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 not needed for the yeast balloon? (a) a paper clip (b) dry yeast (c) warm water (d) a balloon
2. 2.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) salt (d) vinegar
3. 3.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we change it (b) we keep it the same (c) we measure it
5. 5.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) warm water (d) a mirror
7. 7.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
8. 8.🔮 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
9. 9.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
10. 10.⚖️ 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 sugar (b) the amount of water (c) the amount of yeast (d) the water temperature
11. 11.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
12. 12.True or false: salt is something yeast needs. (a) False (b) True
13. 13.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
14. 14.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a magnet (c) a battery cell (d) a mirror
16. 16.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
17. 17.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) salt (d) warm water
18. 18.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
19. 19.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) a mirror (d) sugar
20. 20.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
21. 21.⚖️ 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) False (b) True
22. 22.⚖️ 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 change it (b) we measure it (c) we keep it the same
23. 23.True or false: warm water is something yeast needs. (a) False (b) True
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a comb (d) a balloon
25. 25.True or false: sugar is something yeast does not need. (a) False (b) True
26. 26.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little
27. 27.🍞 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
28. 28.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) salt (d) sunlight
29. 29.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) salt (d) sugar
30. 30.⚖️ 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 change it (b) we keep it the same (c) we measure it
31. 31.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) dry yeast (d) a paper clip
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a magnet (c) a small bottle (d) a balloon
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) turmeric powder (d) sugar
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a paper clip (c) a small bottle (d) dry yeast
35. 35.⚖️ 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 keep it the same (b) we measure it (c) we change it
36. 36.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
39. 39.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it glows (d) it turns to sugar
40. 40.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it

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