Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 511 · 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.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
2. 2.⚖️ 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 measure it (b) we change it (c) we keep it the same
3. 3.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) put it in your mouth (d) throw it at a wall
4. 4.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
5. 5.⚖️ 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
6. 6.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a battery cell (c) a small bottle (d) a mirror
8. 8.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
9. 9.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) it turns to bread (d) the balloon is bigger
10. 10.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.⚖️ 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) the same bottles (d) size of the balloon
12. 12.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
13. 13.⚖️ 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 change it (c) we keep it the same
14. 14.True or false: vinegar is something yeast does not need. (a) False (b) True
15. 15.True or false: a comb is needed for the yeast balloon. (a) False (b) True
16. 16.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) a magnet (d) warm water
17. 17.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) very salty (d) boiling hot
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) True (b) False
19. 19.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
20. 20.🔍 Which is the odd one out? (a) time (b) salt (c) a magnet (d) vinegar
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a magnet (c) sugar (d) a balloon
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
24. 24.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to colour it (d) to make it sweet
25. 25.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
26. 26.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
27. 27.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) salt (d) vinegar
30. 30.🍞 Which of these is something yeast needs? (a) sunlight (b) warm water (c) salt (d) a magnet
31. 31.⚖️ 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 measure it (b) we change it (c) we keep it the same
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a small bottle (d) a paper clip
33. 33.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) a balloon (d) a paper clip
36. 36.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
37. 37.🔍 Which is the odd one out? (a) vinegar (b) salt (c) a magnet (d) sugar
38. 38.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
39. 39.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a balloon (d) a comb

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