Molecular formula :
nature : from two or more elements of the material atoms. Have certain characteristics, often have a certain component. For example, water is compounds, liquid under normal temperature, the boiling point of 100 ° C; , The freezing point 0 ° C, hydrogen, oxygen composed of two elements. A water molecules H2O from two hydrogen atoms and an oxygen atom form. The mixture of compounds with the main difference is : (a) compounds of elements not only to maintain the quality of state property; (2) compounds of elements necessary to use chemical methods before separation; (3 tablespoons compounds are usually composed of a constant.
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