Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 324 · 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.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
2. 2.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) it is food for yeast (d) to make it sweet
3. 3.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a tiny living fungus (d) a kind of salt
4. 4.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
5. 5.⚖️ 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
6. 6.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) it shrinks to nothing (d) the balloon is smaller
7. 7.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) a magnet (d) sugar
8. 8.⚖️ 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
9. 9.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.🍞 Which of these is something yeast needs? (a) time (b) vinegar (c) a magnet (d) salt
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) a balloon (d) a magnet
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) warm water (d) turmeric powder
13. 13.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) turmeric powder (d) dry yeast
14. 14.True or false: sugar is something yeast does not need. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) salt (b) sugar (c) sunlight (d) a magnet
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
17. 17.⚖️ 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 keep it the same (c) we measure it
18. 18.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
19. 19.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
20. 20.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
21. 21.True or false: sunlight is something yeast does not need. (a) False (b) True
22. 22.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) put it in your mouth (d) throw it at a wall
23. 23.⚖️ 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 yeast (c) the same bottles (d) size of the balloon
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) a small bottle (d) turmeric powder
25. 25.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
26. 26.🔍 Which is the odd one out? (a) vinegar (b) time (c) sugar (d) warm water
27. 27.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
29. 29.True or false: vinegar is something yeast needs. (a) True (b) False
30. 30.True or false: a comb is needed for the yeast balloon. (a) True (b) False
31. 31.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) sugar (d) a magnet
33. 33.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
34. 34.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) a magnet (d) sugar
35. 35.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) vinegar (d) warm water
36. 36.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a paper clip (d) a balloon
38. 38.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
40. 40.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False

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