elements and compounds basic to life

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 defined as a pure substance as it 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. It cannot be further reduced to simpler substances by ord..

Pure and Impure Substances - All matter can be broadly divided into two major groups "Pure" and "Impure". The term 'purity' has quite a different meaning in chemistry than in our day-to-day life. Normally when we refer to pure water, pure milk, etc., what is implied is that the water, mil..

Summary - Pure substances are made up of only one type of constituent particles. They are homogenous and have a definite set of properties characteristic of themselves. An element is a pure substance that is made up of only one kind of atoms. An atom is the smallest particle of an el..

According to the chemical classification of matter there are two main categories: Pure substances Mixtur..

..

..

..

Foods [starch, sugar, fats, vitamins, proteins] Fuels [wood, coal, alcohol, petrol] Household and commercial articles [paper, soap, cosmetics, oils, paints] Textile fabrics [cotton, wool, silk, linen, rayon, nylon] Drugs and disinfectants [penicillin, quinine, aspirin, sulpha drugs] ..

A compound is a pure substance made up of two or more elements combined in a definite proportion by mass, which could be split by suitable chemical method..