1972 Ap - Chemistry [top] Free Response Answers

A−(aq)+H2O(l)⇌HA(aq)+OH−(aq)A raised to the negative power open paren a q close paren plus H sub 2 O open paren l close paren is in equilibrium with HA open paren a q close paren plus OH raised to the negative power open paren a q close paren Kbcap K sub b using the water autoionization constant (

Calculate the standard enthalpy of formation (ΔH°f) of C2H5OH(l).

To find the standard electromotive force of the cell, identify the reduction and oxidation half-reactions. Use the standard reduction potential table: 1972 ap chemistry free response answers

In 1972, the free response section (then called "Part II") typically consisted of . Students had 90 minutes. No periodic table with atomic weights? You had to memorize them (or at least round well). No calculators? You had a slide rule or long division.

(to get 2C on left). [ 2C + 2O2 → 2CO2 \quad ΔH = -787.0 , \textkJ ] Students had 90 minutes

The 1972 AP Chemistry free response questions are no longer officially available from the College Board, but I can try to help you with the answers based on my training data. Keep in mind that these answers may not be exactly what the original graders were looking for, but I'll do my best to provide accurate and helpful responses.

This buffer resists pH changes based on Le Châtelier's principle: No calculators

Based on compiled AP exam resources, the 1972 free-response section included questions from several key chemistry topics. Below are the questions and their standard answers.

[ ΔH = (+1367) + (-787.0) + (-857.4) ] [ ΔH = 1367 - 1644.4 = -277.4 , \textkJ/mol ]

Below is an analysis of prominent questions from the 1972 exam and their solutions. Coordination Chemistry and Complex Ions