AP CHEM UNIT 7 MCQ Exam questions and answers Graded A+| 2026 Updated

AP CHEM UNIT 7 MCQ Exam questions and answers Graded A+| 2026 Updated The particle diagram shown above represents the dissolution of CuCl(s) assuming an equilibrium concentration for Cu+ ions of about 4×10−4M in a saturated solution at 25°C. The equilibrium being represented is shown in the following chemical equation. CuCl(s)⇄Cu+(aq)+Cl−(aq) Which of the following changes to the particle diagram will best represent the effect of adding 1.0mL of 4MNaCl to the solution? - B Some of the Cu+ and Cl− ions combine to form CuCl(s) because the molar solubility will be lower than 4×10−4M. The increase in the concentration of Cl− ions in solution with the addition of NaCl will disrupt the equilibrium and the rate of the reverse reaction will increase in order to restore the system to a new equilibrium position. As a result, Cu+ and Cu− ions will combine to form CuCl(s) and the molar solubility will be lower than 4×10−4M.