Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 950 · 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.True or false: a magnet is something yeast does not need. (a) False (b) True
2. 2.⚖️ 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 yeast (b) size of the balloon (c) the amount of sugar (d) the water temperature
3. 3.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) sunlight (d) time
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) a comb (d) warm water
5. 5.True or false: sunlight is something yeast does not need. (a) True (b) False
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) sugar (d) a balloon
7. 7.⚖️ 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 change it (b) we measure it (c) we keep it the same
8. 8.⚖️ 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 keep it the same (b) we measure it (c) we change it
9. 9.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
10. 10.True or false: vinegar is something yeast needs. (a) False (b) True
11. 11.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
12. 12.⚖️ 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
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we measure it (b) we keep it the same (c) we change it
14. 14.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) the yeast is killed (d) it grows faster
15. 15.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to make it sweet (d) to colour it
16. 16.True or false: vinegar is something yeast does not need. (a) False (b) True
17. 17.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
18. 18.⚖️ 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 measure it (c) we change it
19. 19.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) dry yeast (c) a magnet (d) a comb
20. 20.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold kills sugar (d) cold water is heavy
21. 21.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) boiling hot (d) very salty
22. 22.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) a mirror (d) dry yeast
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a battery cell (c) dry yeast (d) a small bottle
25. 25.⚖️ 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 measure it (b) we keep it the same (c) we change it
26. 26.🔮 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
27. 27.⚖️ 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
28. 28.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) salt
30. 30.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) time (d) warm water
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) turmeric powder (c) a balloon (d) warm water
32. 32.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
33. 33.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) pour it down the sink (d) throw it at a wall
34. 34.⚖️ 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
35. 35.⚖️ 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
36. 36.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
38. 38.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of yeast (c) the water temperature (d) the same bottles
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) size of the balloon (b) the water temperature (c) the amount of yeast

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