Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 503 · 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.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a paper clip (d) dry yeast
2. 2.True or false: time is something yeast needs. (a) True (b) False
3. 3.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
5. 5.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of sugar (d) a kind of salt
6. 6.True or false: salt is something yeast needs. (a) True (b) False
7. 7.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) turmeric powder (c) dry yeast (d) warm water
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a magnet (d) a balloon
10. 10.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) vinegar
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a mirror (d) sugar
13. 13.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a balloon (c) a mirror (d) a paper clip
14. 14.True or false: warm water is needed for the yeast balloon. (a) False (b) True
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) dry yeast (d) a paper clip
16. 16.⚖️ 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) size of the balloon (b) the same bottles (c) the amount of yeast (d) the water temperature
17. 17.⚖️ 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 same bottles (c) the water temperature (d) size of the balloon
18. 18.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
19. 19.True or false: sugar is something yeast needs. (a) False (b) True
20. 20.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) warm water (d) sugar
21. 21.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) a magnet (d) warm water
22. 22.True or false: vinegar is something yeast needs. (a) False (b) True
23. 23.⚖️ 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) the same bottles (c) size of the balloon
24. 24.True or false: warm water is something yeast needs. (a) False (b) True
25. 25.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
26. 26.⚖️ 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
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False
28. 28.⚖️ 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) the water temperature (c) size of the balloon
29. 29.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
30. 30.⚖️ 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 change it (b) we keep it the same (c) we measure it
31. 31.🧺 Do we need a paper clip 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: size of the balloon is what we measure. (a) False (b) True
33. 33.True or false: a balloon 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? True or false: the amount of yeast is the one thing we change. (a) False (b) True
35. 35.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
36. 36.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) time (d) sugar
37. 37.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
38. 38.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it grows very little (d) it bursts at once
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) dry yeast (d) sugar
40. 40.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar

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