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Unformatted text preview: Lec-7: Chemical Reactions & Stoichiometry Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 1 Writing Balanced Chemical Equations 1442443 In chemical reactions, atoms are neither created nor destroyed toms and charge are conserved) (atoms and charge are conserved) 1442443 Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 2 Writing Balanced Chemical Equations ` Balanced chemical equations follow the law of conservation of mass. Total mass of each element on the reactant side must equal the total mass of each element on the product side. p Total charge of reactant side must equal the total charge of product side. H 2 SO 3 (aq) H 2 O(l) + SO 2 (g) Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 3 Writing Balanced Chemical Equations Important principles: Every chemical compound has a formula hich cannot be altered which cannot be altered. 9 The state of the compound is usually specified The number of atoms of each type must be the same on both sides of the equation...
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