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Unformatted text preview: Writing Chemical Equations A chemical equation shows: A chemical equation shows: • the formulas for reactants and products the formulas for reactants and products • the the physical states physical states of each substance ( of each substance ( s , , l , , g , , aq aq ) • relative numbers of reactants that combine and products relative numbers of reactants that combine and products that form that form • special conditions required for the reaction, such as special conditions required for the reaction, such as constant heating. constant heating. Balanced equation • The number of atoms of each element is the same in the The number of atoms of each element is the same in the products as in that reactants. products as in that reactants. • Conservation of mass is always maintained. Conservation of mass is always maintained. A General Approach to Balancing Equations 1. 1. Identify the reactants and products and write their Identify the reactants and products and write their correct formulas. correct formulas. 2. 2. Write a skeletal equation including physical states. Write a skeletal equation including physical states. 3. 3. Change coefficients one at a time until the atoms of Change coefficients one at a time until the atoms of each element are balanced. (Start with the elements each element are balanced. (Start with the elements that occur least often in the equation.) that occur least often in the equation.) 4. 4. Make a final check by counting the atoms of each Make a final check by counting the atoms of each element on both sides of the equation. element on both sides of the equation. Q> Balance the following equations: 1....
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 Fall '07
 Cao
 Chemistry, pH, Chemical reaction

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