Carbon example sentences

Limestone is found in association with rocks composed of calcium carbonates or calcium and magnesium carbonates.The rear carbon atom (the carbon atom away from the eye) is represented by a circle and the three hydrogen atoms are shown attached to it by the shorter lines drawn at an angle of 120° to each other.Carbon black is obtained by burning hydrocarbons in a limited supply of air.The delocalised ? electron cloud is attracted more strongly by the nuclei of the carbon atoms than the electron cloud localised between two carbon atoms.It then forms other 4-carbon compounds like malic acid or aspartic acid in the mesophyll cells itself, which are transported to the bundle sheath cells.Due to the maximum percentage of s character (50%), the sp hybridised orbitals of carbon atoms in ethyne molecules have highest electronegativity; hence, these attract the shared electron pair of the C-H bond of ethyne to a greater extent than that of the sp2 hybridised orbitals of carbon in ethene and the sp3 hybridised orbital of carbon in ethane.In 1985, third form of carbon known as fullerenes was discovered by H.Chlorofluorocarbons (CFCs) are man-made industrial chemicals used in air conditioning etc.When these are burnt, the products are carbon dioxide, water, oxides of nitrogen and oxides of sulphur.For nomenclature of alkenes in IUPAC system, the longest chain of carbon atoms containing the double bond is selected.Another compound formed between carbon and hydrogen is ethane with a formula of C2H In order to arrive at the structure of simple carbon compounds, the first step is to link the carbon atoms together with a single bond (Figureure 6a) and then use the hydrogen atoms to satisfy the remaining valencies of carbon.Unsaturated hydrocarbons add hydrogen in the presence of catalysts such as palladium or nickel to give saturated hydrocarbons.In spite of this small amount of carbon available in nature, the importance of carbon seems to be immense.Sodium salts of carboxylic acids on heating with soda lime (mixture of sodium hydroxide and calcium oxide) give alkanes containing one carbon atom less than the carboxylic acid.Each layer is composed of planar hexagonal rings of carbon atoms.