Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 683 · 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: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) the balloon is bigger (d) it turns to bread
2. 2.⚖️ 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
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) a small bottle (d) sugar
4. 4.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to colour rice (d) to clean floors
5. 5.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) vinegar (d) warm water
6. 6.🧺 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
7. 7.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) warm water (d) time
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
9. 9.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
10. 10.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.True or false: salt is something yeast needs. (a) True (b) False
12. 12.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
13. 13.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) a magnet (d) dry yeast
14. 14.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) sugar (b) warm water (c) sunlight (d) time
16. 16.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
17. 17.⚖️ 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) size of the balloon (d) the amount of yeast
18. 18.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
19. 19.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) turmeric powder (d) a balloon
21. 21.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) to colour it (d) it is food for yeast
22. 22.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) a small bottle (d) a magnet
23. 23.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a balloon (d) a magnet
25. 25.⚖️ 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
26. 26.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a balloon (c) dry yeast (d) a comb
28. 28.⚖️ 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
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a small bottle (d) a mirror
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) turmeric powder (d) dry yeast
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) the water temperature (c) size of the balloon
32. 32.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) a magnet (d) a small bottle
34. 34.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) salt (d) vinegar
35. 35.True or false: sugar is something yeast needs. (a) True (b) False
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the amount of water (c) the water temperature
37. 37.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) sunlight (d) a magnet
39. 39.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
40. 40.🍞 Which of these is something yeast needs? (a) sunlight (b) warm water (c) salt (d) vinegar

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