🧪 Choice Board Assignments

Triage a conflicting QC dossier: sort reliable from suspect evidence, nest the classification (pure compound in a solution), design one decisive test, and write the QC report (CER).

Design a minimal recovery train that separates a three-layer spill (sand, salt, oil, water) and rebut a peer's flawed classification with a CER.

Classify eight everyday items as element, compound, or mixture (naming the heterogeneous subtype), pick the two trickiest pairs, and author the technique page for the island kit.

Design an undiscovered element, work its isotope mix backward from its atomic mass, and defend its full property set before the review panel.

Audit nine laboratory claims (true/false + correction), rank the safety danger, and finish the chlorine weighted-average audit.

Compare real phase-change materials, predict their KMT behavior, design the deciding experiment, and deliver the design brief (CER).

Audit a hospital pharmacy: verify an IV saltwater recipe, the weigh-out log, the ions-per-bag label, and a dilution note using multi-step mole math.

Render the verdict on two suppliers' synthesis yields: verify the equation, compute theoretical yield, expose the impossible percent, and design the verification lab.

Diagnose an impossible CO2 recovery result: balance the reaction, predict every quantity, and build an error-detection guide from Conservation of Mass.