Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 219 · 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.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
2. 2.⚖️ 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 change it (b) we measure it (c) we keep it the same
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a balloon (d) a battery cell
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) dry yeast (d) turmeric powder
5. 5.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
6. 6.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False
8. 8.⚖️ 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 measure it (c) we change it
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) True (b) False
10. 10.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
11. 11.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) vinegar
12. 12.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
13. 13.🛟 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
14. 14.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of stone (d) a kind of salt
15. 15.⚖️ 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
16. 16.🍞 Which of these is something yeast needs? (a) time (b) salt (c) vinegar (d) a magnet
17. 17.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
18. 18.⚖️ 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) True (b) False
19. 19.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
20. 20.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
22. 22.True or false: vinegar is something yeast does not need. (a) False (b) True
23. 23.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold water is heavy (d) cold makes it pink
24. 24.True or false: warm water is something yeast does not need. (a) False (b) True
25. 25.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
26. 26.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) a magnet (b) salt (c) vinegar (d) sugar
28. 28.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
29. 29.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to colour rice (d) to wash dishes
30. 30.🔮 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
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a magnet (c) sugar (d) a balloon
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) warm water (d) a comb
33. 33.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) a small bottle (d) a magnet
34. 34.True or false: time is something yeast needs. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) sunlight (d) vinegar
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) dry yeast (d) a mirror
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
38. 38.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
39. 39.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
40. 40.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it

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