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In a fractionating column there is a temperature gradient that goes from being very hot at the bottom, to much cooler at the top. Crude oil is a mixture of hydrocarbons of different lengths, and we know that...

A pair of strutural isomers are two molecules which have the same molecular formula; the same number of each atom, but which have these atoms arranged differently, and are therefore distinct molecules. An ex...

When it’s too hot, vasodilation occurs, in which the capillaries near the surface of the skin increase in diameter, allowing more blood to flow through them, releasing heat. Hairs on the skin lie flat. The s...

Leaves have a large surface area so more light hits them. The upper epidermis of the leaf is transparent, allowing light to enter the leaf. The palisade cells contain many chloroplasts which allow light to b...

Mannerism is a modern word used to describe an artistic tendency that involved many forms of art, which developed in Europe after the Renaissance, approximatively in the mid-16th century. For what concerns p...