PCl5(g)⇌PCl3(g)+Cl2(g)cap P cap C l sub 5 open paren g close paren is in equilibrium with cap P cap C l sub 3 open paren g close paren plus cap C l sub 2 open paren g close paren
Below is an analysis of prominent questions from the 1972 exam and their solutions. Coordination Chemistry and Complex Ions 1972 ap chemistry free response answers
Seeing how the AP program has evolved helps you identify the "Big Ideas" that College Board has valued for half a century. Tips for Solving Legacy AP Problems PCl5(g)⇌PCl3(g)+Cl2(g)cap P cap C l sub 5 open
Even in 1972, partial credit was king. Always write out your units. Always write out your units
the fraction with numerator 1.38 g and denominator 5.00 g end-fraction cross 100 % equals 27.7 % cap K sub 2 cap C cap O sub 3 3. Calculate the Mass of Potassium Hydroxide ( cap K cap O cap H The remaining cap H cap C l not used by the carbonate is neutralized by cap K cap O cap H cap H cap C l cap H cap C l cap K sub 2 cap C cap O sub 3 cap H cap C l remaining for cap K cap O cap H If back-titration shows cap H cap C l remained, the amount reacted with cap K cap O cap H
Quantitative problems where students chose 4 out of 6 (35%). Notable Questions and Solutions 1. The Stoichiometry Puzzle (Acid-Base/Gases)