Write balanced net ionic equations for the following reactions.
Remember that the solubility decreases when a common ion is added because the equilibrium shifts to the left (Le Chatelier’s Principle). 2. Gas Laws and Kinetic Molecular Theory
Since the 1972 AP Chemistry free response answers are not officially digitized, the most reliable compilation is found in the (published in 1991), which retroactively printed selected answers from 1970–1989. Look for Appendix C, Table 4.
, the calculated free energy change was determined to be approximately : Rearranging to solve for ΔHcap delta cap H Key Tip : Standard data often provides ΔScap delta cap S ΔHcap delta cap H ; ensure units match before subtracting. ΔHcap delta cap H for this specific 1972 problem was 3. Organic Chemistry: Isomerism
: One question required calculating the standard free energy change ( cap delta cap G raised to the composed with power ) and enthalpy change ( cap delta cap H raised to the composed with power
(after step 1), add NH₃ until basic → Zn(OH)₂ precipitates, then dissolves in excess NH₃ to form [Zn(NH3)4]²⁺. Confirm Zn²⁺ with K4[Fe(CN)6] → pale yellow Zn2[Fe(CN)6] precipitate.
: You can find detailed keys for the Gas Law problems and Acid-Base solutions through various teacher-uploaded repositories. AP FRQ WORKED ANSWER ARCHIVE