Alternatively, the user-generated repository (maintained by a retired California teacher) provides worked-out solutions for the 1972 exam in a downloadable PDF titled Dated_Exams/1972_FRQ_Solutions.pdf .
Given the following standard enthalpies of formation (in kcal/mol, as the 1972 exam used calories, not joules): ( \Delta H_f^\circ [CO_2(g)] = -94.1 ) ( \Delta H_f^\circ [H_2O(l)] = -68.3 ) ( \Delta H_f^\circ [C_2H_2(g)] = +54.2 ) Calculate ( \Delta H^\circ ) for the combustion of acetylene: ( C_2H_2(g) + \frac52O_2(g) \rightarrow 2CO_2(g) + H_2O(l) ) 1972 ap chemistry free response answers
Students had to complete five out of eight equations (15%). Historically, these were presented using chemical names rather than formulas, adding a layer of nomenclature difficulty. The exam tested isomerism by asking students to
The exam tested isomerism by asking students to identify and draw structures for chlorinated and brominated substitutes of ethane and ethene. Equilibrium: Questions often utilized ammonia ( NH3cap N cap H sub 3 ) and ammonium ( NH4+cap N cap H sub 4 raised to the positive power as the 1972 exam used calories