Question

Identify the black substance present in pencils. Write its properties.​

Answer 1

Answer:

Graphite and Clay

Explanation:

The black thing inside the pencil, which actually allows us to write, is not 'lead', although it is mistakenly called that by many. It is actually a mixture of graphite and clay that is ground together in the presence of water and pressed together at very high temperatures into thin rods.

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Answer 2

Answer:

It is graphite.

Explanation:

It is a mineral.Graphite most often occurs in metamorphic rocks formed from regional metamorphism or contact metamorphism of organic-rich sedimentary rocks, such as organic-rich marble, quartzite, schist, gneiss, and metamorphosed coal. As mentioned, graphite forms from the alteration of organic material during metamorphism. They are made from petroleum coke after it is mixed with coal tar pitch. They are then extruded and shaped, baked to carbonize the binder (pitch), and finally graphitized by heating it to temperatures approaching 3000 °C, at which the carbon atoms arrange into graphite.

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