Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 498 · 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.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a small bottle (d) a magnet
4. 4.⚖️ 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 water (d) the water temperature
5. 5.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) warm water (d) time
6. 6.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) keep it for a month (d) put it in your mouth
7. 7.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to colour rice (d) to clean floors
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 keep it the same (b) we change it (c) we measure it
9. 9.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) vinegar
10. 10.True or false: sugar is something yeast needs. (a) False (b) True
11. 11.True or false: sugar is needed for the yeast balloon. (a) False (b) True
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) the amount of water (c) size of the balloon
13. 13.🔍 Which is the odd one out? (a) time (b) salt (c) warm water (d) sugar
14. 14.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
15. 15.⚖️ 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 change it (b) we measure it (c) we keep it the same
16. 16.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) it shrinks to nothing (d) the balloon is bigger
17. 17.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a battery cell (d) a small bottle
19. 19.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
21. 21.⚖️ 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
22. 22.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) warm water (d) a magnet
23. 23.⚖️ 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 change it (b) we keep it the same (c) we measure it
24. 24.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of stone (d) a kind of salt
25. 25.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.True or false: sugar is something yeast does not need. (a) True (b) False
27. 27.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
28. 28.⚖️ 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 same bottles (c) the water temperature
29. 29.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
30. 30.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) vinegar (d) salt
31. 31.True or false: vinegar is something yeast does not need. (a) False (b) True
32. 32.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) a magnet (d) warm water
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a small bottle (c) sugar (d) warm water
35. 35.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
36. 36.⚖️ 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) the amount of water (c) size of the balloon (d) the amount of yeast
37. 37.⚖️ 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 keep it the same (c) we measure it
38. 38.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
39. 39.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
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 kept the same. (a) False (b) True

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