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CHEMICAL REACTIONS.

A  CHEMICAL REACTION  TAKES  PLACE,whenever   bonds between  atoms  are  broken  or  made.In   each  case , atoms  or  groups   of   atoms    rearrange  , making  new  substances (products), from  the  original   ones(reactants). Reaction  happens  naturally  or  can  be  made  to  happen ;they   may  take   years  or only   an  instant  .A  reaction   usually  involves  a  change  in  energy.In  a    burning   reaction  , for   example , the  making  of  new  bonds  between  atoms  release   energy   as  heat  and   light.This  type  of  reaction  in  which   heat  is  given   off,is  an  exothermic  reaction .Many   reactions   , like    burning  is  irreversible, but    some   can take  place   in  either  direction,and    are   said  to  reversible .
Reactions   can  be   used  to  form  solids  from  solutions ;in  a  double    decomposition  reaction   , two  compounds  in  solutions  break down  and reform into  two  substances , often  created  a precipitate(insoluble  solid);In  displacement an   element  (eg.copper)displaces   another  element (eg.silver) from a  solution.The  rate  (speed) of  reaction  is   determined  by  many  factors such  as  temperature,and  the  size  and    shape  of  the reactants .To    describe   and  keep  track   of  reactions ,internationally   recognized  chemical  symbols  and  equations  are  used 
Reactions  are  also   used  in  laboratory  to  identify   matter .An  experiment   with  candle  wax  , for example . demonstrates  that  it  contains  carbon  and  hydrogen.
SALT FORMATION  (ACID  ON  MEAL)
Hydrochloric  acid   added  to  zinc  produces  zinc  chloride  and  hydrogen.-Zn+2HCL- ZNCL2+H2. 
DISPLACEMENT 
Copper  metal  added  to  Silver nitrate solution produces  Copper
nitrate  and  silver    metal.
Cu  +2AgNO3-  Cu(NO3)2  +2Ag
FERMENTATION
Yeast  convert  sugar    and  warm  water  into  alcohol  and  carbon dioxide.
BURNING  MATTER 
When  lit ,  ammonium  dichromate combines  with  Oxygen  from  air.Ammonium  dichromate converts   chromium  oxide.Nitrogen  monoxide(NO) and  water  vapor (H2O)
(NH4)2Cr2O7+O2=Cr2O3+4H2O+2NO.


 

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