DOWNLOAD HSEB NOTES ON REPRESENTING CHEMICAL CHANGE | CHEMISTRY
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Writing Chemical Equations
A chemical equation is an equation that expresses a chemical reaction using symbolic representation of the chemical formulae. Simply put: a chemical equation represents a chemical reaction and each molecule is represented by a chemical formula e.g. H2O represents water. The first equations of the Oswald Process will be used to explain how to read a chemical equation. As stated earlier each compound represents a diferent molecule e.g. NH3 represents Ammonia, O2 represents oxygen, NO represents nitrogen oxide H2O represents water. Compounds on the left of the arrow are called the reactants and the compounds on the right are called the products. A reactant is a com- pound that is needed for the reaction to occur, in this case the reactants are NH3 and O2. What is formed from the reaction is called a product. The products in this reaction are NO and H2O. The coefcients for each of the molecules represent the relative number of reactants needed and products formed. In this case four ammonium molecules will react with five oxygen molecules to form four nitrogen oxide molecules and six water molecules. Occasionally a catalyst is added to the reaction. A catalyst is a substance that speeds up the reaction without undergoing any net change to itself. This is represented in the chemical equation by placing the chemical formula of the catalyst above the arrow.
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