Download HSEB Notes of Chemistry | Representing Chemical Change | Extra Reference | E-Book | Class 10

CHEMISTRY | EXTRA REFERENCE | E-BOOK

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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