Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 687 · 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: turmeric powder is needed for the yeast balloon. (a) False (b) True
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) turmeric powder (c) warm water (d) a balloon
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
4. 4.⚖️ 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
5. 5.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
7. 7.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
8. 8.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
9. 9.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.⚖️ 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
11. 11.⚖️ 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
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) size of the balloon (b) the water temperature (c) the amount of yeast
13. 13.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
14. 14.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
15. 15.⚖️ 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) False (b) True
16. 16.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
17. 17.True or false: vinegar is something yeast needs. (a) True (b) False
18. 18.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of sugar (d) a kind of stone
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a mirror (d) a small bottle
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) dry yeast (c) warm water (d) a balloon
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 amount of yeast (d) the water temperature
23. 23.True or false: sugar is something yeast does not need. (a) True (b) False
24. 24.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
25. 25.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a mirror (c) warm water (d) a small bottle
27. 27.🔍 Which is the odd one out? (a) sugar (b) warm water (c) vinegar (d) time
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a balloon (d) a magnet
29. 29.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to colour it (d) to make it heavy
30. 30.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) turmeric powder (d) a battery cell
31. 31.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) time (d) sunlight
32. 32.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
33. 33.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.⚖️ 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
35. 35.🔍 Which is the odd one out? (a) salt (b) time (c) a magnet (d) sunlight
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a paper clip (d) sugar
37. 37.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
38. 38.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
39. 39.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) steam (d) carbon dioxide gas
40. 40.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) a magnet (d) salt

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