reactions - Reactions and Equations General equation;...

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1 Reactions and Equations General equation; reaction products (you want to see how many atoms are created or destroyed) Ex: PCl 5 (s) + H 2 O (l) H 3 PO 4 (g) + HCl (aq) P Cl H O P Cl H O 1 5 2 1 1 1 4 4 unbalanced equation 1 5 8 4 1 5 8 4 balanced equation balanced formula PCl 5 (s) + 4H 2 O (l) H 3 PO 4 (aq) + 5HCl (aq) step 1: place a 1 in front of the formula with the largest number of atoms (if it is a tie, select the one with the most elements) step 2: balance the elements in the compounds; a) elements in starting formula that are in only one other compound b) all other elements in starting formula c) all other elements in all compound step 3: balanced uncombined element ex: C 3 H 8 + O 2 CO 2 + H 2 O C H O C H O 3 8 2 1 2 3 unbalanced C 3 H 8 + 5O 2 3CO 2 + 4H 2 O 3 8 10 3 8 10 balanced 1. R.5 Combination Reactions A + X AX (a reaction in which two or more substances combine to form a single a single product) Reaction between sodium and chlorine to form sodium chloride is a combination reaction:
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This note was uploaded on 09/02/2011 for the course CHEM 2 taught by Professor Harrison during the Spring '11 term at West Valley.

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reactions - Reactions and Equations General equation;...

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