Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 956 · 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 a small bottle for the yeast balloon? (a) not needed (b) needed
2. 2.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) warm water (d) a mirror
3. 3.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.True or false: vinegar is something yeast needs. (a) False (b) True
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a balloon (d) a magnet
6. 6.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a tiny living fungus (d) a kind of sugar
7. 7.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) salt (d) time
8. 8.⚖️ 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 measure it (c) we keep it the same
9. 9.⚖️ 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) True (b) False
10. 10.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink
11. 11.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
12. 12.🔮 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
13. 13.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) dry yeast (c) warm water (d) sugar
15. 15.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a comb (c) dry yeast (d) a paper clip
16. 16.⚖️ 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 keep it the same (b) we change it (c) we measure it
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 yeast (b) the amount of water (c) the amount of sugar (d) the water temperature
18. 18.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) a magnet (d) sugar
19. 19.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a battery cell (c) sugar (d) a balloon
21. 21.True or false: salt is something yeast needs. (a) False (b) True
22. 22.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
23. 23.True or false: a comb is needed for the yeast balloon. (a) True (b) False
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) warm water (c) dry yeast (d) sugar
25. 25.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
26. 26.True or false: warm water is something yeast needs. (a) False (b) True
27. 27.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
29. 29.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
30. 30.🔍 Which is the odd one out? (a) sunlight (b) salt (c) a magnet (d) warm water
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) warm water (d) turmeric powder
32. 32.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) vinegar
35. 35.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
36. 36.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
37. 37.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) it turns to bread (d) the balloon is smaller
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.⚖️ 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 change it (c) we measure it
40. 40.⚖️ 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) False (b) True

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