AEPA Chemistry NT306 case studies
AEPA Chemistry NT306 · Put your knowledge to work in context.
The AEPA Chemistry test (test code NT306) is one of the Arizona Educator Proficiency Assessments, a suite of knowledge and professional-knowledge tests used in Arizona's teacher certification process. The program is administered by Pearson, and the official AEPA site lists NT306 Chemistry among its subject knowledge tests. The AEPA Chemistry NT306 case studies are 5 cases and about 2,488 words.
1Calibrating a Thermometer with a Suspect Ice Bath
A student calibrates a digital thermometer before a calorimetry lab. The procedure states: prepare an ice-water slurry in a 250 mL beaker, stir for 3 minutes, and record the temperature as the 0.0 °C reference.
454 words, about 2 min2Two Students, Two Densities for the Same Metal
Two lab partners determine the density of an unknown metal cylinder. Student A measures mass on a balance (24.87 g) and volume by water displacement in a 50 mL graduated cylinder (initial 20.0 mL, final 23.1 mL).
407 words, about 2 min3The Reaction That Won't Go Faster
Students study the reaction of magnesium ribbon with 1.0 M HCl by collecting gas in a syringe. Trial 1 uses a 2 cm ribbon at 22 °C and gives a steady but slow rate.
480 words, about 2 min4Why the Product Doesn't Match the Formula
Students precipitate a metal carbonate by mixing 25.0 mL of 0.20 M CaCl₂ with 25.0 mL of 0.20 M Na₂CO₃. They filter, dry, and weigh the solid, expecting CaCO₃ (molar mass 100.09 g/mol).
618 words, about 3 min5The Emission Spectrum That Suggests the Wrong Element
Students use a hand-held spectroscope to observe the visible emission lines of an unknown gas discharge tube. They record a bright line near 590 nm and a fainter line near 610 nm and tentatively identify the gas as sodium, whose strong yellow doublet sits near 589–590 nm.
529 words, about 3 min