Equilibrium was a major component. Students needed to calculate equilibrium concentrations, determine Kacap K sub a for weak acids, and calculate the solubility product ( Kspcap K sub s p end-sub
Ideal gas behavior and gravimetric calculations. 1972 ap chemistry free response answers
According to Le Chatelier's principle, decreasing the volume of a gaseous system increases the overall pressure. The system counteracts this stress by shifting the equilibrium toward the side with fewer moles of gas. The reactant side ( NO2cap N cap O sub 2 ) has 2 moles of gas. The product side ( N2O4cap N sub 2 cap O sub 4 ) has 1 mole of gas. Equilibrium was a major component
pH=−log[H+]=−log(6.32×10-3)≈2.20pH equals negative log open bracket cap H raised to the positive power close bracket equals negative log open paren 6.32 cross 10 to the negative 3 power close paren is approximately equal to 2.20 Part B: pH at the Equivalence Point At the equivalence point, all HNO2cap H cap N cap O sub 2 reacts with NaOHcap N a cap O cap H to form the conjugate base, NO2−cap N cap O sub 2 raised to the negative power The system counteracts this stress by shifting the
Ptotal=PNO2+PN2O4cap P sub total end-sub equals cap P sub cap N cap O sub 2 end-sub plus cap P sub cap N sub 2 cap O sub 4 end-sub :
There was a heavier reliance on knowing chemical names by heart, as formulas were often omitted in the prompts.