1972 Ap Chemistry Free Link Response Answers [Validated × 2027]

→ White precipitate of AgCl and PbCl₂ forms. Zn²⁺ remains in solution.

1972 was a year that tested the "spontaneity" of reactions before the term "Gibbs Free Energy" was as ubiquitous in high school classrooms as it is today. Predicting the sign of ΔScap delta cap S (entropy) and ΔHcap delta cap H (enthalpy). The Answer Key Logic: If a gas is produced from solids, ΔScap delta cap S is positive (disorder increases). If the reaction vessel gets hot, ΔHcap delta cap H is negative (exothermic). 1972 ap chemistry free response answers

Combustion yields 22.0 g CO2 and 9.00 g H2O from 10.0 g sample. Find empirical formula. Steps: convert CO2 → C moles, H2O → H moles, divide by smallest, get whole-number ratio → empirical formula. → White precipitate of AgCl and PbCl₂ forms

Assuming the metal has a $+3$ oxidation state (based on $M_2O_3$): $$ 2M + 6HCl \rightarrow 2MCl_3 + 3H_2 $$ Predicting the sign of ΔScap delta cap S