Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 517 · 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.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) vinegar (d) sugar
2. 2.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
3. 3.True or false: salt is something yeast does not need. (a) True (b) False
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) dry yeast (d) a battery cell
5. 5.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) sugar (d) time
6. 6.True or false: warm water is something yeast needs. (a) False (b) True
7. 7.True or false: a magnet is something yeast needs. (a) False (b) True
8. 8.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to make bread rise (d) to colour rice
9. 9.True or false: sugar is something yeast does not need. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sunlight (d) time
11. 11.True or false: sunlight is something yeast needs. (a) True (b) False
12. 12.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
13. 13.True or false: vinegar is something yeast does not need. (a) False (b) True
14. 14.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) sugar (d) dry yeast
16. 16.🔮 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
17. 17.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of sugar (d) a kind of salt
18. 18.⚖️ 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
19. 19.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
20. 20.⚖️ 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 same bottles (c) the amount of yeast (d) size of the balloon
21. 21.True or false: a mirror is 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? What do we do with “the amount of water”? (a) we change it (b) we measure it (c) we keep it the same
23. 23.🔍 Which is the odd one out? (a) warm water (b) time (c) vinegar (d) sugar
24. 24.⚖️ 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
25. 25.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) a balloon (d) a battery cell
27. 27.True or false: warm water is needed for the yeast balloon. (a) True (b) False
28. 28.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
29. 29.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
30. 30.True or false: vinegar is something yeast needs. (a) False (b) True
31. 31.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold kills sugar (c) cold water is heavy (d) cold makes it pink
32. 32.⚖️ 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
33. 33.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
34. 34.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
35. 35.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it sweet (d) to make it heavy
36. 36.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a small bottle (c) dry yeast (d) sugar
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a paper clip (d) a small bottle
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a magnet (c) a balloon (d) warm water
40. 40.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger

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