Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 896 · 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.⚖️ 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 sugar (c) size of the balloon (d) the amount of yeast
2. 2.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of salt (d) a kind of sugar
3. 3.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
4. 4.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
5. 5.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) it turns to sugar (d) the yeast is killed
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a mirror (c) sugar (d) a small bottle
8. 8.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
9. 9.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
10. 10.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a comb (c) turmeric powder (d) a magnet
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a magnet (c) warm water (d) sugar
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) True (b) False
15. 15.True or false: warm water is something yeast does not need. (a) True (b) False
16. 16.True or false: sunlight is something yeast does not need. (a) True (b) False
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a balloon (c) warm water (d) a small bottle
18. 18.True or false: vinegar is something yeast does not need. (a) True (b) False
19. 19.🍞 Which of these is something yeast needs? (a) a magnet (b) time (c) salt (d) sunlight
20. 20.⚖️ 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
21. 21.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
22. 22.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) air from outside (d) smoke
23. 23.⚖️ 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 measure it (b) we change it (c) we keep it the same
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) a small bottle (c) dry yeast (d) warm water
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 the one thing we change. (a) True (b) False
26. 26.⚖️ 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
27. 27.🔮 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
28. 28.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) it turns to bread (d) the balloon is smaller
29. 29.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) sunlight (d) warm water
30. 30.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
31. 31.🔍 Which is the odd one out? (a) time (b) a magnet (c) warm water (d) sugar
32. 32.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) sugar (d) a magnet
33. 33.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a paper clip (c) a mirror (d) a battery cell
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 water (b) the water temperature (c) size of the balloon
35. 35.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to colour it (d) to make it heavy
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) the water temperature (b) size of the balloon (c) the same bottles
37. 37.⚖️ 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
38. 38.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
39. 39.🔍 Which is the odd one out? (a) time (b) warm water (c) vinegar (d) sugar
40. 40.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) salt (d) warm water

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