WORD EQUATIONS

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WORD EQUATIONS

• Chapter 6.1

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• A word equation is one way of representing a
  chemical reaction.
• It tells you what reacts and what is produced.
• Are an efficient way to describe chemical
  changes, to help chemists recognize patterns, and
  to predict the products of a chemical reaction.

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• Word equations are written in a certain format.
• Names of what is reacting Names of
  what is produced
• ( reactants )
  ( products )
• Reactants and products are separated by plus ()
  signs and the arrows show the change from before
  the reaction to after the reaction.
• Reactant 1 Reactant 2 product 1
  product 2

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EXAMPLES

• Wood Spark Fire smoke heat
• Fabric thread buttons shirt
• The iron in a car reacts with oxygen to produce
  iron (III) oxide.
• Iron oxygen iron(III) oxide

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EXAMPLES

• We can also change this word equation into
  formula equation. ( skeleton equation )
• Fe O2 Fe2O3

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TRY THIS

• Write a word and formula equation for the
  following
• 1) Zinc is added to hydrogen monochloride and
  this produces hydrogen and zinc chloride.
• Answer
• Zinc hydrogen monochloride hydrogen zinc
  chloride
• Zn HCl H2 ZnCl2

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TRY THIS

• 2) Sodium reacts with calcium bromide to make
  calcium and sodium bromide
• Answer
• Sodium calcium bromide calcium
  sodium bromide
• Na CaBr2 Ca NaBr

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TRY THIS

• 3) Carbon dioxide and water are produced when
  methane is added to oxygen.
• Answer
• Methane oxygen carbon dioxide water
• CH4 O2 CO2 H2O

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HOMEWORK

• DO QUESTIONS 2 AND 3 ON PAGE 219