Three Lab Groups Carried Out an Experiment to Identify the Concentration

question 40

Multiple Choice

Three lab groups carried out an experiment to identify the concentration of sucrose in six solutions. Each unknown solution (1-6) contained one of the following sucrose concentrations: 0.0 M, 0.2 M, 0.4 M, 0.6 M, 0.8 M, and -1.0 M. Cubes of sweet potato (1 cm3) were soaked for 24 hours in each solution and weighed to determine the change in mass. Each data entry represents the average of three sample replicates expressed as percent change in mass following a 24-hour soak in the unknown solutions. From the data given, which statement below most accurately describes something that has occurred in response to a particular unknown solution?

• A) Unknown solution 5 contains the highest concentration of sucrose, and the change in mass is due to the active transport of sucrose out of the cell.
• B) Osmosis of water molecules from unknown solution 2 likely caused the increase in mass observed.
• C) Passive transport of sucrose out of the potato cells explains the change in mass observed for unknown solution 6.
• D) Unknown solution 3 represents a sucrose concentration slightly higher than the molarity of sweet potato cells, thus water is transported out of the cells.

---

Definitions:

Prevention Cost

Expenses incurred to avoid or minimize the number of defects in products, including costs associated with quality control and training.

Life Cycle Costing

An approach that considers all the costs associated with the lifecycle of a product or asset, from acquisition through disposal, aimed at understanding the total cost of ownership.

Target Costing

A pricing method in which market prices determine the cost constraints for product development, aiming to ensure competitiveness and profitability.

Appraisal Costs

Expenses related to the testing and inspection of products to ensure they meet quality standards.