Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 855 · 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.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
2. 2.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it grows much faster (d) it turns yellow
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) a small bottle (d) turmeric powder
4. 4.🍞 Which of these is something yeast does not need? (a) vinegar (b) warm water (c) sugar (d) time
5. 5.⚖️ 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
6. 6.⚖️ 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 keep it the same (b) we measure it (c) we change it
7. 7.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) throw it at a wall (d) pour it down the sink
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a comb (d) sugar
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) False (b) True
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) turmeric powder (c) dry yeast (d) sugar
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of water (b) the water temperature (c) size of the balloon (d) the same bottles
13. 13.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
14. 14.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a tiny living fungus (d) a kind of sugar
16. 16.True or false: dry yeast 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? What do we do with “the amount of yeast”? (a) we change it (b) we measure it (c) we keep it the same
18. 18.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
19. 19.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
20. 20.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a small bottle (c) warm water (d) a balloon
22. 22.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) time (d) sugar
23. 23.True or false: sugar is needed for the yeast balloon. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) vinegar (d) warm water
25. 25.⚖️ 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 water temperature (c) the amount of yeast
26. 26.🔮 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
27. 27.🔍 Which is the odd one out? (a) time (b) vinegar (c) sunlight (d) salt
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) a mirror (d) warm water
29. 29.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) the yeast is killed (d) it turns to sugar
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) a balloon (c) warm water (d) sugar
31. 31.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
32. 32.⚖️ 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 sugar (b) size of the balloon (c) the water temperature
33. 33.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it heavy (d) to make it sweet
34. 34.True or false: a magnet is something yeast needs. (a) False (b) True
35. 35.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
36. 36.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) sugar (d) time
37. 37.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) True (b) False
39. 39.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
40. 40.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) sugar (c) dry yeast (d) warm water

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