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Chemical Equation Balancing Guide

Learn how to balance chemical equations step by step. Gain the skills to write balanced equations using a systematic approach, starting from reactants to products and ensuring equilibrium of atoms. Practice examples included.

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Chemical Equation Balancing Guide

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  1. Objectives • To be able to write a balanced equation for a chemical reaction Pb(NO3)2 (aq) + 2NaI (aq) PbI2 (s) + 2NaNO3 (aq)

  2. A chemical reaction is balanced by using a systematic approach: • Write the formulas of the reactants and products to give the unbalanced chemical equation. • Balance by trial and error starting with the most complicated molecule(s). Leave pure elements to the end. • At the end check to be sure the equation is balanced (same numbers of all types of atoms on the reactant and product sides).

  3. Example:  • Hydrogen gas and oxygen gas combine to form liquid water. • Write the formulas of the reactants and products to give the unbalanced chemical equation. H2(g) + O2(g) H2O(l)

  4. Hydrogen gas and oxygen gas combine to form liquid water.

  5. Example:  • Hydrogen gas and oxygen gas combine to form liquid water. • At the end check to be sure the equation is balanced (same numbers of all types of atoms on the reactant and product sides). 2H2(g) + O2(g) 2H2O(l)

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