Page 239 - ICSE Chemistry 8

12. Discuss the technique of fi ltra on.
13. Discuss the technique of dis lla on with the help of a well-labelled diagram.
14. With the help of an ac vity, show how a mixture of kerosene and water can be separated.
15. What is paper chromatography? Discuss the advantages of paper chromatography.
16. Write the postulates of Dalton’s atomic theory.
17. Discuss the experiment conducted by J.J. Thomson.
18. Write the characteris cs of cathode rays and anode rays.
19. Write a note on structural stability of an atom.
20. Discuss the forma on of electroposi ve ions and electronega ve ions.
21. List the rules for representa on of elements.
22. How is the chemical formula of a compound derived?
23. Show how the chemical formula is derived for the following compounds: water, carbon dioxide,
calcium hydroxide and sodium carbonate.
24. Discuss how chemical equa ons are derived from word equa ons.
25. Balance the chemical equa on that represents the reac on between magnesium and oxygen to
form magnesium oxide.
26. Write the characteris cs of a chemical reac on.
27. Write the condi ons necessary for chemical reac ons.
28. Diff eren ate between catalyst and enzyme.
29. Write a note on combina on reac ons.
30. What is the importance of neutralisa on reac ons in our daily life?
31. Discuss the occurrence of hydrogen.
32. Discuss the discovery of hydrogen.
33. Discuss the prepara on of hydrogen by the ac on of water on metals.
34. Discuss the prepara on of hydrogen by the ac on of dilute acids on metals.
35. Write a note on the laboratory prepara on of hydrogen.
36. With the help of an ac vity, show that rainwater does not contain any dissolved impuri es but well
water contains them.
37. Discuss the purifi ca on of water by dis lla on.
38. Discuss the physical proper es of water.
39. Discuss the dissolu on of salts in water.
40. With the help of an ac vity, show that copper sulphate crystals contain water of crystallisa on.
41. Write the chemical proper es of carbon.
42. Write the proper es and uses of diamond.
43. Write the proper es and uses of graphite.
44. With the help of an ac vity, show that charcoal is a good reducing agent.
45. Discuss the prepara on of carbon dioxide.

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