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Conservation of Matter

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					The Law of Conservation
       of Matter

    Matter can’t be
 created nor destroyed
 There are 2 parts to any
   chemical reaction
• Reactants
• Products
           Reactants
• The substances that a reaction
  starts with
• These react with each other
           Products

• The substances that a reaction
  ends with
         yield
Reactants  Products
  Describing a Chemical
        Reaction
Solid lead (II) nitrate, dissolved in
water, plus solid potassium iodide,
dissolved in water, yield solid lead
 (II) iodide plus potassium nitrate,
         dissolved in water.
 There must be an easier
         way
• We use abbreviations
  –Chemical Formulas
  –Symbols
       Chemical Formulas

• Lead (II) Nitrate   • Pb(NO3)2
• Potassium Iodide    • KI
• Lead (II) Iodide    • PbI2
• Potassium           • KNO3
  Nitrate
Symbol   Meaning
  +
          Solid
  (g)
  
          liquid
Symbol           Meaning
 Light
  
          Aqueous, solid dissolved in
                    water
 Elect.
  
             Reactants are heated
Symbol   Meaning
   +       Plus
 (cr)     Solid
 (g)       Gas
         yields
  (l)     liquid
Symbol            Meaning
 Light     Reactants are exposed to
                    light
 (aq)     Aqueous, solid dissolved in
                      water
 Elect.   Electric current is applied to
                   reactants
 Heat         Reactants are heated
  
Pb(NO3)2 (aq)+2KI(aq) 
  PbI2(cr) + 2KNO3(aq)

				
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