DIAMOND.pptx group work from igcse chemistry

DIAMOND.pptx group work from igcse chemistry

• 1.
  DIAMON D A giant covalentallotrope of carbon. GROUP DELWIN PRESENTS:
• 2.
  First, what isan allotrope? • When an element can exist in more than one physical form in the same state it is said to exhibit allotropy (or polymorphism). • In this case, carbon can exist as slippery, soft graphite, and that same carbon can exist as strong, hard diamond. Each of the different physical forms is called an allotrope.
• 3.
  DIAMOND AS ANALLOTROPE OF CARBON. • Carbon is a non-metallic element which exists in more than one solid structural form. Its allotropes are called graphite and diamond. Each of the allotropes has a different structure and so the allotropes exhibit different physical properties . The different physical properties that they exhibit lead to the allotropes being used in different ways. • Diamond is very hard. As a matter of fact, it considered the hardest known natural material and is used in drills, saws, and cutters.
• 4.
  Diamond structure This imageshows the diamond structure. Each of the carbon atoms in the giant structure is covalently bonded to four others. They form a tetrahedral arrangement. This bonding structure gives rise to a very rigid, three- dimensional structure and accounts for the extreme hardness of diamond.
• 5.
  Properties and usesof diamond PROPERTIES • It is a colorless, transparent crystal. • It doesn’t conduct electricity because there are no free electrons to move. • As said before, it is the hardest natural substance. USES • Used as jewellery and ornaments. • Used on a dentist’s drill (and on other drills, too) • Used as a toothed saw to cut marble. The Regent Diamond has been worn b the late Queen Elizabeth II.
• 6.
  A little funfact • It is possible to manufacture the different allotropes of carbon. Diamond is made by heating graphite to about 300°C at very high pressures. Diamond made by this method is known as industrial diamond. Graphite can be made by heating a mixture of coke and sand at a very high temperature in an electric arc furnace for about 24 hours.