classification of elements by lavoisier

A.L.Lavoisier and P.S.Laplace gave this law in 1780 which states that 'the enthalpy of a reaction is exactly equal but opposite in sign for the reverse reaction'. For example, if D H is the enthalpy change in going from A to B then the enthalpy change for the process B to A would be - D..

Elements, Compounds and Mixtures - According to the chemical classification of matter there are two main categories: Pure substances Mixtur..

Hydrogen was named by Lavoisier using the Greek words 'Hydro' ie., water and 'Genes' meaning forming. Chlorine has its origin from Greek word - 'Chloros' - meaning greenish yellow, 'Bromos' means stench in Greek and 'Iodes' in Greek means violet. The word nickel has originated fro..

An element is the simplest form of matter that cannot be split into simpler substances or built from simpler substances by any ordinary chemical or physical method. There are 110 elements known to us, out of which 92 are naturally occurring while the rest have been prepared art..

Elements - "An element is a pure substance which is made up of only one kind of atoms having the same atomic number." "The smallest particle of an element is the atom which, has all the properties of that element." "An element..

An element is a pure substance which is made up of only one kind of atoms having the same atomic numbe..

Daniel Rutherford, a Scottish Physician, discovered nitrogen in 1772. But it was Lavoisier, who proved that nitrogen is an element and that it was not a supporter of combustion and respiration. He called it 'azote' meaning 'no life'. The name 'Nitrogen' was given to it by ..

a) Oxygen and nitrogen b) Sodium and mercury (amalgam) c) Copper and zinc allo..

The elements, which take part in the metabolic activities of plants, whether essential or non-essential are named as functional elements..

Periodicity of Elements - The recurrence of similar properties of the elements when they are arranged in the order of increasing atomic number, after certain regular intervals, is called periodici..