Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 621 · 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) vinegar (b) time (c) salt (d) a magnet
2. 2.🍞 Which of these is something yeast needs? (a) salt (b) warm water (c) vinegar (d) a magnet
3. 3.True or false: warm water is something yeast does not need. (a) False (b) True
4. 4.⚖️ 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
5. 5.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) pour it down the sink (d) throw it at a wall
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) dry yeast (d) a magnet
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) warm water (d) a paper clip
8. 8.🔮 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
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) turmeric powder (d) dry yeast
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) sugar (d) a comb
11. 11.⚖️ 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 change it (b) we keep it the same (c) we measure it
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) dry yeast (d) a mirror
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of yeast (c) the same bottles (d) the water temperature
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a paper clip (d) a balloon
15. 15.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
16. 16.⚖️ 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) False (b) True
17. 17.⚖️ 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 water (b) the same bottles (c) the water temperature (d) the amount of sugar
18. 18.⚖️ 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
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) False (b) True
20. 20.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) a magnet
22. 22.⚖️ 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
23. 23.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of stone (d) a kind of sugar
24. 24.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
25. 25.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) turmeric powder (c) warm water (d) a small bottle
27. 27.🔮 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
28. 28.🔍 Which is the odd one out? (a) salt (b) sunlight (c) a magnet (d) warm water
29. 29.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to colour it (d) to make it heavy
30. 30.True or false: a magnet is something yeast needs. (a) True (b) False
31. 31.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) vinegar (d) sugar
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) warm water (d) a magnet
33. 33.⚖️ 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
34. 34.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.⚖️ 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 measure it (b) we change it (c) we keep it the same
36. 36.⚖️ 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
37. 37.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
38. 38.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) steam (d) air from outside
39. 39.⚖️ 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
40. 40.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True

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