Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 450 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a battery cell (d) warm water
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a magnet (c) sugar (d) dry yeast
3. 3.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) time (d) sugar
4. 4.True or false: salt is something yeast does not need. (a) True (b) False
5. 5.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
6. 6.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
7. 7.🔍 Which is the odd one out? (a) salt (b) time (c) sugar (d) warm water
8. 8.⚖️ 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 sugar (b) the water temperature (c) the amount of yeast (d) the amount of water
9. 9.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
10. 10.⚖️ 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
11. 11.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
12. 12.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
13. 13.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) sugar (d) vinegar
14. 14.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it grows faster (d) it glows
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a mirror (d) a balloon
16. 16.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
17. 17.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) throw it at a wall (d) pour it down the sink
18. 18.⚖️ 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) size of the balloon (c) the amount of yeast (d) the amount of water
19. 19.True or false: a magnet is something yeast needs. (a) False (b) True
20. 20.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
22. 22.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a balloon (c) sugar (d) a small bottle
24. 24.🔍 Which is the odd one out? (a) time (b) vinegar (c) warm water (d) sugar
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) dry yeast (d) a paper clip
26. 26.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
27. 27.⚖️ 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) True (b) False
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) dry yeast (d) a mirror
29. 29.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) time (d) a magnet
30. 30.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a comb (c) a magnet (d) turmeric powder
31. 31.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
32. 32.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.True or false: sunlight is something yeast needs. (a) False (b) True
34. 34.True or false: warm water is something yeast needs. (a) False (b) True
35. 35.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
36. 36.⚖️ 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 change it (b) we measure it (c) we keep it the same
37. 37.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) warm water (d) a battery cell
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a battery cell (d) sugar
39. 39.True or false: sugar is something yeast needs. (a) False (b) True
40. 40.⚖️ 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

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