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Conceptual Problem: A student takes two identical containers. Container A has a dry wooden block, and Container B has a dry cloth sponge. The student drops 5 mL of blue ink onto the wooden block (Container A) and 5 mL of blue ink onto the cloth sponge (Container B). After 2 minutes, the student checks both items. Describe the exact physical location of the blue ink in Container A and Container B, and name the specific physical chemistry process happening in each container. Step 1: Analyze Container A with the wooden block. Wood is non-porous and compact on a microscopic scale, meaning liquid cannot easily enter its bulk interior. Step 2: Conclude the process for Container A. The blue ink molecules remain strictly on the outer boundary of the wooden block. This surface-only concentration is defined as adsorption. Step 3: Analyze Container B with the cloth sponge. A cloth sponge is full of tiny pores, hollow spaces, and capillaries that allow liquids to penetrate deeply. Step 4: Conclude the process for Container B. The blue ink molecules travel deep inside, filling the internal spaces uniformly throughout the entire volume of the sponge. This bulk penetration is defined as absorption. Step 5: Final summary answer. Container A demonstrates adsorption (surface phenomenon), while Container B demonstrates absorption (bulk phenomenon).