Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 485 · 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.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) sugar (d) a paper clip
3. 3.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) smoke (d) air from outside
4. 4.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to make it sweet (d) to colour it
5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it turns yellow (d) it grows very little
6. 6.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
7. 7.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
8. 8.True or false: warm water is needed for the yeast balloon. (a) False (b) True
9. 9.🧺 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 battery cell
10. 10.True or false: warm water is something yeast does not need. (a) True (b) False
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 sugar”? (a) we keep it the same (b) we measure it (c) we change it
12. 12.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
13. 13.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
14. 14.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) a magnet (d) time
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) warm water (d) a magnet
16. 16.🔍 Which is the odd one out? (a) sunlight (b) time (c) warm water (d) sugar
17. 17.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) vinegar (d) sugar
18. 18.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a small bottle (c) sugar (d) a balloon
20. 20.⚖️ 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 measure it (b) we keep it the same (c) we change it
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) sugar (c) a paper clip (d) turmeric powder
22. 22.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
23. 23.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a tiny living fungus (d) a kind of salt
24. 24.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
25. 25.🍞 Which of these is something yeast needs? (a) warm water (b) sunlight (c) salt (d) vinegar
26. 26.⚖️ 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
27. 27.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
29. 29.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
30. 30.⚖️ 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) True (b) False
31. 31.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
32. 32.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) keep it for a month (d) throw it at a wall
33. 33.⚖️ 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 change it (b) we keep it the same (c) we measure it
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
35. 35.True or false: vinegar is something yeast does not need. (a) True (b) False
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) warm water (d) dry yeast
37. 37.⚖️ 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 amount of yeast (c) the amount of sugar (d) the water temperature
38. 38.⚖️ 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 measure it (c) we change it
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) sugar (d) a comb
40. 40.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True

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