Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 18 · 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 comb is not needed for the yeast balloon. (a) True (b) False
2. 2.True or false: a magnet is something yeast needs. (a) True (b) False
3. 3.🍞 Does yeast need vinegar 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 water temperature”? (a) we keep it the same (b) we measure it (c) we change it
5. 5.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) sugar (d) a battery cell
6. 6.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the amount of water (c) size of the balloon
7. 7.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
8. 8.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) a mirror (d) warm water
10. 10.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) vinegar
11. 11.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) time (d) a magnet
13. 13.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) sugar (d) salt
14. 14.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
15. 15.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
16. 16.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of salt (d) a kind of sugar
17. 17.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a comb (d) dry yeast
19. 19.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
20. 20.🧺 Do we need warm water 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? What do we do with “the amount of yeast”? (a) we change it (b) we keep it the same (c) we measure it
22. 22.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
23. 23.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) a balloon (d) a small bottle
25. 25.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
26. 26.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of sugar (c) size of the balloon (d) the amount of water
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) dry yeast (d) a battery cell
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a mirror (c) warm water (d) sugar
30. 30.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) True (b) False
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the amount of yeast
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
34. 34.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) pour it down the sink (d) put it in your mouth
35. 35.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
36. 36.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) dry yeast (d) a magnet
38. 38.⚖️ 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 change it (c) we measure it
39. 39.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
40. 40.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) sugar (c) warm water (d) dry yeast

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