Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 613 · 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.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
2. 2.⚖️ 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
3. 3.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) vinegar
4. 4.⚖️ 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 water (d) size of the balloon
5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows very little (d) it grows much faster
6. 6.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) salt (d) sugar
7. 7.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
8. 8.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
9. 9.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
10. 10.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down
11. 11.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) a magnet (d) warm water
12. 12.⚖️ 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 measure it (b) we keep it the same (c) we change it
13. 13.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
14. 14.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it heavy (d) to make it sweet
15. 15.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
16. 16.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) the balloon is bigger (d) it turns to bread
17. 17.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
18. 18.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) salt (d) time
19. 19.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a comb (c) a mirror (d) a paper clip
20. 20.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
21. 21.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
22. 22.⚖️ 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 keep it the same (b) we change it (c) we measure it
23. 23.⚖️ 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 sugar (b) the water temperature (c) the amount of yeast (d) the amount of water
24. 24.True or false: warm water is something yeast needs. (a) True (b) False
25. 25.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
26. 26.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) vinegar
27. 27.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) sunlight
28. 28.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
29. 29.⚖️ 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
30. 30.True or false: sunlight is something yeast does not need. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) sugar (d) time
32. 32.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.🔍 Which is the odd one out? (a) sugar (b) salt (c) sunlight (d) a magnet
34. 34.⚖️ 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) True (b) False
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a comb (d) sugar
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a battery cell (d) sugar
37. 37.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of sugar (d) a kind of stone
38. 38.⚖️ 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 same bottles
39. 39.🔍 Which is the odd one out? (a) salt (b) warm water (c) time (d) sugar
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False

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