The 1972 AP Chemistry free response section consisted of several questions that tested students' understanding of various chemistry concepts. Here are the answers to some of the questions:
Below are the reconstructed questions and worked solutions for the 1972 Free Response section.
The Problem:Explaining the trends in first ionization energy across a period or down a group, specifically referencing the 1972 focus on the transition metals or second-row elements. The Solution Path: Effective Nuclear Charge ( Zeffcap Z sub e f f end-sub 1972 ap chemistry free response answers
4. Chlorine gas is bubbled through a solution of sodium bromide.
The 1972 exam expected students to demonstrate a high level of algebraic manipulation and a deep understanding of the relationship between macroscopic observations and molecular behavior. Key themes included: Gas Laws: Ideal vs. non-ideal behavior. Equilibrium: Solving for concentrations using Kccap K sub c Kpcap K sub p Thermodynamics: Entropy, enthalpy, and Gibbs free energy. The 1972 AP Chemistry free response section consisted
To the modern student: Do not be discouraged if your answers differ slightly from the 1972 keys. The periodic table atomic masses have been updated (e.g., Carbon was 12.01 then, and still is today – but some transition metals have changed). Focus on the process, not the vintage number.
Set up the ICE table: Reaction: $NH_4^+ \rightleftharpoons NH_3 + H^+$ The Solution Path: Effective Nuclear Charge ( Zeffcap
The "Net Ionic" gauntlet—students had to choose 5 out of 8 equations to write from names alone (15%).