Carbon is a very common element that exists in the atmosphere and crust in many forms. Carbon monouples have been recognized and used for a long time. A series of carbon compounds -organic matter is the foundation of life. Carbon is one of the ingredients of raw iron, cooked iron and steel. Carbon can form a large number of compounds in chemical self -combination, which is an important molecule in biology and business. Most molecules in organisms contain carbon.

Existing form

The form of carbon existence is diverse, including crystalline single -quality carbon such as diamond and pulse graphite; there are fordless carbon and coal; there are complex organic compounds such as animals and plants; carbonate such as marble. The physical and chemical properties of single carbon depend on its crystal structure. High -hardness diamond and soft and smooth pulse graphite crystal structures are different, each with its own appearance, density, melting point, etc.

Characteristics

The chemical properties of single carbon at room temperature are relatively stable, insoluble in water, dilute acid:

1) Lubrication: The lubrication performance of pulse graphite depends on the size of the pulse graphite scales. The larger the scales, the smaller the friction coefficient, and the better the lubrication performance.

2) Chemical stability: The pulse graphite has good chemical stability at normal temperature, which can be corrosion of acid, alkali and organic solvents.

3) Plasticity: The toughness of the pulse graphite is good, which can be crushed into a thin thin piece.

4) Anti -shock resistance: The pulse graphite can withstand the severe changes in the temperature at room temperature without damage. When the temperature mutations are mutated, the volume of the pulse graphite does not change greatly and will not cause cracks.