Chemical reaction equation

Equation describe chemical reactions which consisted of reagent chemical formula and reaction products with coefficients respectively . In a chemical reaction , one or more substances may be transformed into a new kind of substance . Substances react called reagent ( reactant ) , while the new substances produced are called the reaction product ( product ) . John Dalton argued that , the type and number of atoms involved in the reaction has not changed , but the chemical bond between the two substances change . The changes can be explained by using the chemical formulas of substances involved in the reaction equation is called . For example , the reaction between hydrogen gas with oxygen gas to form water can be explained as follows :
2H2 ( g ) + O2 ( g ) → 2H2O ( )
Symbols used in the equation , such as:
→ produce+ plus( s ) solid ( solids )( g ) gas( ) Liquid ( fluid )( Aq) aquous ( dissolved in water )
Numbers that precede the chemical formula of the substance in the equation is called the coefficient of the reaction . In the example above can be explained that the coefficient of hydrogen is 2 , the coefficient of oxygen is 1 , and the coefficient of water is 2 . Posting equation can be done in two steps
a. Write down the formula of reactants and products , complete with a description of his form .
b . Equivalency , which gives the coefficients corresponding to the same number of atoms of each element on both formulas .

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