Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 395 · 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? What do we do with “the amount of water”? (a) we measure it (b) we keep it the same (c) we change it
2. 2.🍞 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
3. 3.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
4. 4.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
5. 5.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
6. 6.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a kind of stone (d) a tiny living fungus
7. 7.True or false: sunlight is something yeast does not need. (a) False (b) True
8. 8.True or false: warm water is something yeast does not need. (a) True (b) False
9. 9.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) throw it at a wall (d) put it in your mouth
10. 10.⚖️ 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 water
11. 11.⚖️ 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) False (b) True
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) sugar (c) a balloon (d) dry yeast
13. 13.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) salt (d) time
14. 14.🔍 Which is the odd one out? (a) time (b) vinegar (c) a magnet (d) sunlight
15. 15.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
16. 16.⚖️ 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 water temperature (c) the same bottles (d) size of the balloon
17. 17.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.True or false: a comb is needed for the yeast balloon. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) salt (b) sunlight (c) sugar (d) vinegar
20. 20.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) a magnet
21. 21.🧺 Do we need turmeric powder 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) the amount of water (b) the amount of sugar (c) the water temperature (d) the same bottles
23. 23.True or false: time is something yeast does not need. (a) True (b) False
24. 24.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
25. 25.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
26. 26.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
27. 27.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) a comb (d) a balloon
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) a paper clip (d) sugar
29. 29.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) a battery cell (d) a small bottle
30. 30.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) turmeric powder (d) dry yeast
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 yeast”? (a) we measure it (b) we change it (c) we keep it the same
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a battery cell (c) warm water (d) sugar
34. 34.⚖️ 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
35. 35.🍞 Which of these is something yeast needs? (a) vinegar (b) sugar (c) salt (d) sunlight
36. 36.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
37. 37.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a small bottle (d) a mirror
39. 39.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
40. 40.⚖️ 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

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