Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 604 · 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 dry yeast for the yeast balloon? (a) needed (b) not needed
2. 2.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
3. 3.🍞 Which of these is something yeast needs? (a) time (b) a magnet (c) salt (d) sunlight
4. 4.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it bursts at once (d) it grows very little
6. 6.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) sugar (d) time
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) turmeric powder (d) a small bottle
8. 8.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) sugar (c) dry yeast (d) a small bottle
10. 10.⚖️ 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
11. 11.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) a magnet (d) sugar
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
13. 13.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
14. 14.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
15. 15.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
16. 16.⚖️ 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 amount of water (c) the amount of yeast (d) the water temperature
17. 17.⚖️ 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
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 keep it the same (b) we measure it (c) we change it
19. 19.⚖️ 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 measure it (c) we keep it the same
20. 20.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a tiny living fungus (d) a kind of stone
21. 21.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) time (d) vinegar
23. 23.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
25. 25.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
26. 26.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) smoke (d) air from outside
27. 27.⚖️ 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
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a paper clip (c) sugar (d) warm water
29. 29.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a paper clip (c) a small bottle (d) a balloon
31. 31.True or false: sugar is needed for the yeast balloon. (a) True (b) False
32. 32.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.⚖️ 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
34. 34.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down
35. 35.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it sweet (d) to make it heavy
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) dry yeast (c) a balloon (d) a small bottle
37. 37.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to clean floors (d) to colour rice
38. 38.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.🍞 Which of these is something yeast does not need? (a) warm water (b) sunlight (c) time (d) sugar
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) a small bottle (d) a comb

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