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Balancing Chemical Equations

Balancing Chemical Equations. Chemical Equation. Shorthand way of writing what happens in a chemical reaction CH 4 + 2 O 2  CO 2 + 2 H 2 O. Rules for Balancing Equations. Must satisfy the Law of Conservation of Matter If 11 atoms enter the reaction, 11 atoms must leave

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Balancing Chemical Equations

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  1. Balancing Chemical Equations

  2. Chemical Equation • Shorthand way of writing what happens in a chemical reaction • CH4 + 2 O2 CO2 + 2 H2O

  3. Rules for Balancing Equations • Must satisfy the Law of Conservation of Matter • If 11 atoms enter the reaction, 11 atoms must leave • Balance using only whole number coefficients!

  4. Tips for Balancing Equations • Write the reactants and products in the equation, making sure ALL atoms appear on both sides of the arrow • Check to see if the equation is already balanced • Coefficients go IN FRONT OF the substance and multiply all of the subscripts • NO FRACTIONS – use only whole numbers

  5. Tips for Balancing Equations • One (1) is understood and does not have to be written as a coefficient • All coefficients should be in lowest terms (Ex: 6, 4, 2 is reduced to 3, 2, 1) • In a double replacement reaction, balance the polyatomic ion as a group

  6. Tips for Balancing Equations • Balance the most complex species first (and elements other than H and O), then move on to single atoms, such as H and O • DOUBLE-CHECK YOUR WORK! • There is no excuse for getting these incorrect!

  7. Examples • BaS + NaCl Na2S + BaCl2 • BaS + 2NaCl Na2S + BaCl2 • NH4Cl + Ba(OH)2 BaCl2 + NH4OH • 2 NH4Cl + Ba(OH)2 BaCl2 + 2 NH4OH

  8. Examples • P + O2 P2O5 • 4 P + 5 O22 P2O5 • Na2O2 + H2O NaOH + O2 • 2 Na2O2 + 2 H2O 4NaOH + O2 • KClO3 KClO4 + KCl • 4 KClO33 KClO4 + KCl

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