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Writing Chemical Equations

Writing Chemical Equations. Chemical equations. are a specific description of what happens in a reaction. Ex. 2H 2 O  2H 2 + O 2. 2 parts - Chem. equations. 1. Reactants (left of arrow). - substances that undergo a reaction. 2. Products (right of arrow).

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Writing Chemical Equations

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  1. Writing Chemical Equations

  2. Chemical equations are a specific description of what happens in a reaction Ex. 2H2O  2H2 + O2

  3. 2 parts - Chem. equations 1. Reactants (left of arrow) - substances that undergo a reaction 2. Products(right of arrow) - new substances produced

  4. Balancing Chem. Equations • law of conservation of mass must be followed • Mass/matter (atoms) cannot be created or destroyed in a reaction

  5. C -1 C -1 Li - 1 Li - 2 O - 3 O - 4 H - 1 H - 2 Use coefficients - balance # of atoms on each side of arrow Example CO2+ LiOH Li2CO3+ H2O

  6. When trying to balance both sides of the equation Do not change the subscripts

  7. CO2+ LiOH  Li2CO3+ H2O 2 Carbon - 1 Carbon - 1 Oxygen - 4 Oxygen - 4 Lithium - 2 Lithium - 2 Hydrogen - 2 Hydrogen - 2 2 is the coefficent

  8. Cl2 + NaBr  NaCl + Br2 2 2

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