Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 338 · 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.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
2. 2.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) warm water (d) time
3. 3.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it bursts at once (d) it grows very little
4. 4.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a tiny living fungus (d) a kind of stone
5. 5.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) sugar (d) vinegar
6. 6.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
7. 7.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
8. 8.⚖️ 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
9. 9.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing
10. 10.⚖️ 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 amount of yeast (b) the amount of water (c) the amount of sugar (d) the water temperature
11. 11.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the water temperature”? (a) we change it (b) we measure it (c) we keep it the same
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a magnet (c) dry yeast (d) a balloon
14. 14.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) it is food for yeast (d) to colour it
15. 15.⚖️ 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
16. 16.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) warm water (d) sunlight
17. 17.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to wash dishes (d) to make bread rise
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
19. 19.⚖️ 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) True (b) False
20. 20.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
21. 21.🛟 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
22. 22.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
23. 23.True or false: sugar is something yeast needs. (a) False (b) True
24. 24.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
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) the amount of water (b) the water temperature (c) size of the balloon
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a magnet (c) dry yeast (d) a small bottle
27. 27.⚖️ 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) size of the balloon (c) the amount of yeast (d) the same bottles
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) False (b) True
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) warm water (c) a balloon (d) dry yeast
30. 30.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
31. 31.True or false: vinegar is something yeast does not need. (a) True (b) False
32. 32.🍞 Which of these is something yeast needs? (a) time (b) salt (c) vinegar (d) a magnet
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a balloon (d) a paper clip
34. 34.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.⚖️ 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) False (b) True
36. 36.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.True or false: warm water is something yeast needs. (a) True (b) False
38. 38.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
39. 39.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
40. 40.⚖️ 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

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