Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 67 · 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) it turns to bread (b) the balloon is bigger (c) the balloon is smaller (d) it shrinks to nothing
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a paper clip (d) dry yeast
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a small bottle (d) a comb
4. 4.True or false: warm water is something yeast does not need. (a) False (b) True
5. 5.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of stone (d) a kind of sugar
6. 6.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) a small bottle (d) dry yeast
8. 8.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) a magnet (d) salt
9. 9.True or false: vinegar is something yeast does not need. (a) True (b) False
10. 10.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) it glows (d) the yeast is killed
11. 11.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a paper clip (c) warm water (d) a balloon
14. 14.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it bursts at once (d) it grows much faster
15. 15.🔍 Which is the odd one out? (a) salt (b) vinegar (c) a magnet (d) time
16. 16.True or false: warm water 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? True or false: the water temperature is kept the same. (a) True (b) False
18. 18.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
19. 19.⚖️ 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 keep it the same (b) we measure it (c) we change it
20. 20.True or false: sugar is something yeast needs. (a) True (b) False
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a comb (c) a paper clip (d) a mirror
22. 22.⚖️ 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) False (b) True
23. 23.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
24. 24.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
25. 25.⚖️ 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
26. 26.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
27. 27.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
29. 29.⚖️ 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
30. 30.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) it is food for yeast (d) to make it heavy
31. 31.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
32. 32.⚖️ 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
33. 33.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of yeast (b) size of the balloon (c) the water temperature
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a small bottle (c) sugar (d) warm water
36. 36.True or false: a comb is needed for the yeast balloon. (a) False (b) True
37. 37.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a battery cell (c) a magnet (d) a mirror
38. 38.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) time (d) sugar
39. 39.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) vinegar (d) salt
40. 40.True or false: time is something yeast does not need. (a) True (b) False

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