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FCS Physics and Chemistry

Chemical Reactions and Equations
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The world around us is constantly changing.  Some of these changes result from substances undergoing phase changes, such as ice melting or water boiling.  Some of these changes results in totally different products being formed.  We will look at both of these kinds of changes.
 
Physical Changes - are changes of phase and DO NOT result in the formatio of a new product
 
  • Examples include: melting, vaporization, sublimation, condensation and freezing
 
Chemical Changes - result from chemical reactions and new products are formed
 
  • Examples include: burning of paper and thousands of other chemical interactions

Chemical Equations

A chemical equation shows what takes place during a chemical reaction.  It is similiar to an algebraic equation in that what is written on one side of the equation equals what is written on the other side.  An arrow is used instead of an equal sign to seperate the sides of the equation.  The arrow is read produces or yields. 
 
A chemical reaction consists of two parts:
 
Reactants: are what goes INTO the reaction and are written on the LEFT SIDE of the equation
 
Products: are what COMES OUT of the reaction (is produced) and is written on the RIGHT SIDE of the
 
For Example
 
Reactions can either RELEASE energy or ABSORB energy
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Exothermic reactions release energy
 
For example: the burning or carbon in oxygen..FIRE!
 
C(s)  +  O2(g)  -->  CO2(g)
 
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Endothermic processes absorb energy
 
For example: Ice melting
 
H2O(s)  +  energy  --> H2O(l)

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Forestville Central School
4 Academy Street
Forestville, NY 14062