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Download 09 NOTES Balancing Equations COMPLETE
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COMPLETE BALANCING EQUATIONS PARTS OF A CHEMICAL EQUATION REACTANTS ________________________________ - the ions ( elements ) being chemically combined to make a new compound PRODUCT ________________________________ - the new compound that results from combining the reactants Reactants Li + O Product Li2O ________________________________ Dilithium oxide __________________________________ 2 BINARY COMPOUND _________________________________– a compound composed of two different elements WRITING FORMULAS and BALANCING EQUATIONS Write the symbol of the element with the positive oxidation number 1. ________________________________________________________________________ ________________________________________________________________________ Write the symbol of the element with the negative oxidation number 2. ________________________________________________________________________ ________________________________________________________________________ “Criss-cross the oxidation numbers for subscripts on the product side 3. ________________________________________________________________________ ________________________________________________________________________ 3 Example: To combine Li (lithium) and O (oxygen), do the following: +1 + O-2 Li _________________________________________________________________________ Li + O Li2O1 _________________________________________________________________________ Since oxygen’s subscript is 1, it is not written in the final version of the formula _________________________________________________________________________ Li + O Li2O ( Two atoms of Li; one atom of O ) _________________________________________________________________________________________ _________________________________________________________________________________________ 4 To balance the Equations: Reactants Li + O Product Li2O Label the diatomic element on the reactant side ONLY. 1. ________________________________________________________________________ You will be provided a list of diatomic element ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ 5 Reactants Li + O2 Product Li2O Diatomic Subscript 6 There must be the same number of atoms of each element on both Remember: _______________________________________________________________ sides of the equation _________________________________________________________________________ 2 oxygen 4Li + O 2Li2O 4 lithium 7 Using the Coefficients, balance the non-metal first, then balance the metal 2. ________________________________________________________________________ ________________________________________________________________________ Reactants Li metal 4Li Product + O2 Li2O non-metal + O 2Li2O Coefficients 8 DIATOMIC ELEMENTS __________________________________ - elements whose atoms exist in nature and are always found in pairs Diatomic Elements Follow These Steps Balancing Equations Element Symbol Nitrogen N2 1. Write the symbol for the metal, then a + sign Oxygen O2 2. Write the symbol for the nonmetal, then the Fluorine F2 3. Write the compound formula (Example: NaCl) Chlorine Cl2 4. Do the “criss-cross” to label subscripts in the product Bromine Br2 5. Label the diatomics on the REACTANT SIDE ONLY Iodine I2 6. Balance the nonmetal first (Example: O2) Hydrogen H2 7. Balance the metal 8. Use Coefficients as needed 9. See examples in the notes 9
