Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 132 · 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.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a tiny living fungus (d) a kind of sugar
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a mirror (d) a balloon
3. 3.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a small bottle (d) a paper clip
5. 5.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
6. 6.🛟 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
7. 7.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) a magnet (d) time
8. 8.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
9. 9.True or false: warm water is not 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 water”? (a) we change it (b) we measure it (c) we keep it the same
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) a battery cell (d) warm water
12. 12.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
14. 14.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
15. 15.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it grows faster (d) it turns to sugar
16. 16.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) salt
17. 17.True or false: a mirror 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) dry yeast (b) a battery cell (c) sugar (d) a small bottle
19. 19.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) a magnet
20. 20.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
21. 21.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
22. 22.⚖️ 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 yeast (c) size of the balloon
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a paper clip (d) a small bottle
24. 24.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
25. 25.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
26. 26.⚖️ 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 water temperature (b) the amount of water (c) the same bottles (d) the amount of yeast
27. 27.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
28. 28.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
29. 29.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it grows much faster (d) it bursts at once
30. 30.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of yeast (b) the amount of sugar (c) the same bottles (d) size of the balloon
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
33. 33.🍞 Which of these is something yeast needs? (a) sunlight (b) warm water (c) vinegar (d) salt
34. 34.True or false: a comb is needed for the yeast balloon. (a) True (b) False
35. 35.⚖️ 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
36. 36.⚖️ 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
37. 37.True or false: warm water is something yeast needs. (a) True (b) False
38. 38.True or false: sugar is something yeast needs. (a) True (b) False
39. 39.⚖️ 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 keep it the same (b) we measure it (c) we change it
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a paper clip (c) a magnet (d) a mirror

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