Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 751 · 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 something yeast does not need? (a) sugar (b) sunlight (c) warm water (d) time
2. 2.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) warm water (c) dry yeast (d) sugar
4. 4.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
5. 5.⚖️ 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) True (b) False
6. 6.True or false: warm water is something yeast does not need. (a) True (b) False
7. 7.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a magnet (c) a battery cell (d) a paper clip
8. 8.⚖️ 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
9. 9.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
10. 10.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
11. 11.🔍 Which is the odd one out? (a) time (b) salt (c) warm water (d) sugar
12. 12.True or false: sugar is something yeast does not need. (a) True (b) False
13. 13.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
14. 14.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
15. 15.⚖️ 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 amount of water (c) size of the balloon
16. 16.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
17. 17.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) sugar (d) salt
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) warm water (c) a balloon (d) sugar
19. 19.True or false: sugar is needed for the yeast balloon. (a) False (b) True
20. 20.⚖️ 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
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) size of the balloon (c) the amount of sugar (d) the amount of yeast
22. 22.🍞 Which of these is something yeast needs? (a) a magnet (b) time (c) salt (d) vinegar
23. 23.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
24. 24.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
25. 25.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to wash dishes (d) to make bread rise
26. 26.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
27. 27.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.True or false: vinegar is something yeast needs. (a) False (b) True
29. 29.True or false: warm water is needed for the yeast balloon. (a) True (b) False
30. 30.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it bursts at once (d) it grows much faster
31. 31.⚖️ 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 keep it the same (b) we measure it (c) we change it
32. 32.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
33. 33.🔍 Which is the odd one out? (a) time (b) warm water (c) vinegar (d) sugar
34. 34.⚖️ 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 yeast (c) size of the balloon (d) the same bottles
35. 35.⚖️ 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
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.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
38. 38.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) it turns to sugar (d) the yeast is killed
39. 39.True or false: salt is something yeast needs. (a) True (b) False
40. 40.⚖️ 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 yeast (b) size of the balloon (c) the water temperature

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