Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 980 · 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 battery cell for the yeast balloon? (a) not needed (b) needed
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) dry yeast (c) a balloon (d) sugar
3. 3.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of salt (d) a kind of sugar
4. 4.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it glows (d) it grows faster
5. 5.True or false: sugar is something yeast does not need. (a) False (b) True
6. 6.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we measure it (b) we change it (c) we keep it the same
8. 8.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
9. 9.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to make bread rise (d) to colour rice
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) sugar (c) a balloon (d) warm water
11. 11.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) warm water (d) salt
12. 12.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) time (d) salt
13. 13.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
14. 14.⚖️ 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 water
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 sugar”? (a) we measure it (b) we keep it the same (c) we change it
16. 16.⚖️ 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
17. 17.🔮 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
18. 18.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
19. 19.True or false: warm water is something yeast does not need. (a) True (b) False
20. 20.⚖️ 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 keep it the same (b) we measure it (c) we change it
21. 21.⚖️ 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) size of the balloon (c) the amount of sugar (d) the same bottles
22. 22.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) time (d) warm water
23. 23.True or false: time is something yeast needs. (a) True (b) False
24. 24.⚖️ 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
25. 25.⚖️ 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 yeast (b) size of the balloon (c) the amount of water (d) the water temperature
26. 26.⚖️ 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 sugar
27. 27.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a small bottle (c) sugar (d) dry yeast
29. 29.True or false: sugar is something yeast needs. (a) False (b) True
30. 30.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
31. 31.🧺 Do we need dry yeast 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? True or false: the water temperature is the one thing we change. (a) True (b) False
33. 33.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.🍞 Which of these is something yeast does not need? (a) a magnet (b) time (c) sugar (d) warm water
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a comb (c) sugar (d) a balloon
36. 36.🔍 Which is the odd one out? (a) salt (b) sugar (c) sunlight (d) a magnet
37. 37.⚖️ 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
38. 38.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
40. 40.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a balloon (c) a battery cell (d) a magnet

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