CHEMISTRY · Multi-part · AP · Chemistry · Chemical Reactions · Chemical Reactions
Problem
While preparing dinner, a student makes the following observations:
(a) For each observation I–IV, classify the change as physical or chemical and cite specific macroscopic evidence that supports your classification.
(b) Choose one of the changes you classified as chemical. Describe, in terms of the particles present, what is happening to the composition and bonding of the substance(s).
(c) Choose one of the changes you classified as physical. Describe, at the particle level, how the arrangement and motion of particles differ between the initial and final states.
(d) For each change, propose a practical laboratory or household method that could reverse the change. Indicate whether your proposed reversal is realistically achievable and explain why.