Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 796 · 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 what we measure? (a) the amount of sugar (b) the water temperature (c) the amount of yeast (d) size of the balloon
2. 2.⚖️ 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 measure it (c) we keep it the same
3. 3.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) warm water (d) a magnet
4. 4.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) salt (d) sunlight
6. 6.⚖️ 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 change it (b) we keep it the same (c) we measure it
7. 7.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) it glows (d) the yeast is killed
8. 8.🔍 Which is the odd one out? (a) time (b) sugar (c) a magnet (d) warm water
9. 9.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) put it in your mouth (d) throw it at a wall
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) warm water (d) a battery cell
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) False (b) True
12. 12.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
13. 13.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
14. 14.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
15. 15.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it turns yellow (d) it grows very little
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a small bottle (d) a paper clip
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a comb (d) a small bottle
18. 18.🍞 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
19. 19.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
20. 20.⚖️ 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
21. 21.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
22. 22.⚖️ 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 amount of yeast (c) the amount of water (d) the water temperature
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) turmeric powder (d) warm water
24. 24.True or false: warm water is needed for the yeast balloon. (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 kept the same? (a) size of the balloon (b) the water temperature (c) the amount of yeast
26. 26.⚖️ 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
27. 27.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
28. 28.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
30. 30.True or false: sugar is something yeast does not need. (a) False (b) True
31. 31.True or false: sugar is something yeast needs. (a) True (b) False
32. 32.⚖️ 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
33. 33.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) vinegar
34. 34.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) sugar (d) time
35. 35.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sugar (d) sunlight
36. 36.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
38. 38.True or false: sunlight is something yeast needs. (a) False (b) True
39. 39.True or false: vinegar 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? True or false: size of the balloon is the one thing we change. (a) True (b) False

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