Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 159 · 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 paper clip is needed for the yeast balloon. (a) False (b) True
2. 2.⚖️ 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
3. 3.⚖️ 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
4. 4.⚖️ 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 yeast (c) size of the balloon
5. 5.🔍 Which is the odd one out? (a) warm water (b) sugar (c) vinegar (d) time
6. 6.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
7. 7.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
8. 8.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of salt (d) a kind of stone
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) a paper clip (d) a small bottle
10. 10.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
11. 11.⚖️ 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) True (b) False
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a comb (d) a balloon
13. 13.⚖️ 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
14. 14.🍞 Which of these is something yeast needs? (a) sunlight (b) sugar (c) vinegar (d) a magnet
15. 15.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a battery cell (d) a small bottle
17. 17.⚖️ 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
18. 18.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
19. 19.🍞 Which of these is something yeast does not need? (a) warm water (b) vinegar (c) time (d) sugar
20. 20.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) a magnet (d) time
21. 21.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) it is food for yeast (d) to colour it
22. 22.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) sunlight
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) a comb (d) a small bottle
24. 24.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) salt (d) sugar
25. 25.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
26. 26.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) put it in your mouth (d) throw it at a wall
27. 27.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
28. 28.⚖️ 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
29. 29.⚖️ 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) the amount of water (c) the water temperature (d) the amount of sugar
30. 30.⚖️ 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 measure it (b) we keep it the same (c) we change it
31. 31.True or false: salt is something yeast needs. (a) False (b) True
32. 32.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) it glows (d) the yeast is killed
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) turmeric powder (d) warm water
34. 34.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
35. 35.⚖️ 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 keep it the same (b) we change it (c) we measure it
36. 36.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) warm water (b) time (c) salt (d) sugar
38. 38.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
40. 40.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True

Free science experiments lessons, practice and worksheets at talentjr.in/science-experiments-for-kids