There are  basic 120 chemical elements in this world. When two or more chemical elements combined together to form one substance such substance is called as a chemical composition. These compounds are  widely divided into two categories, organic and inorganic. Every matter is made up of various elements and chemical compounds. When more than one substance or compositions are mixed together, it is known as mixture. E.g. soil, wood. Any material having definite chemical composition is known as chemical substance.e.g. Water, sugar, salt etc. One of the prime properties of chemical substance is that they can't be separated into another substances through mechanical process. Chemical substances are found in three forms namely solid, liquid and gas. However chemical substances may change their forms due to changes in temperature or pressure. Each chemical substance carries a unique systematic name. Chemical substances which can't be transformed or broken down by ordinary chemical process are known as chemical element or simply element.

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