ORELA Chemistry (NT321) case studies
ORELA Chemistry (NT321) · Put your knowledge to work in context.
The ORELA Chemistry assessment (test code NT321) is a National Evaluation Series™ educator licensure test offered through the Oregon Educator Licensure Assessments program. It is intended for prospective Oregon teachers who need to demonstrate chemistry content knowledge for licensure, and it is delivered as a computer-based test (CBT) at test centers in Oregon and nationwide, or as an online-proctored test taken remotely, including from home. The ORELA Chemistry (NT321) case studies are 5 cases and about 2,247 words.
1Flame Test and Emission Lines in an Unknown Chloride
During a unit on atomic structure, a lab group heats an unknown chloride salt in a Bunsen flame and records a strong yellow-orange color. Their handheld spectrometer logs two strong lines at 589.0 and 589.6 nm and weak lines at 568.2, 616.1, and 670.8 nm.
478 words, about 2 min2Hydrate Mass Error in a Copper Displacement Lab
Students react 2.00 g of copper(II) sulfate pentahydrate with 0.50 g of iron nails in 50 mL of water. After the blue color fades, they filter, wash, and dry the copper and recover 0.45 g.
410 words, about 2 min3Separating Temperature and Chloride Effects in a Cobalt Equilibrium
Students prepare a 0.10 M CoCl2 solution in a water–ethanol mixture. At room temperature the solution is pink.
457 words, about 2 min4Choosing Between Ester Isomers from IR and NMR Evidence
Four groups propose structures for an unknown with molecular formula C4H8O2: butanoic acid, ethyl acetate, methyl propanoate, and 1,4-dioxane. The available data are: IR has a strong sharp absorption at 1740 cm−1 and no broad absorption from 2500 to 3300 cm−1; 1H NMR shows a triplet at δ 1.25 (3H), a singlet at δ 2.05 (3H), and a quartet at δ 4.10 (2H); the compound is neutral, dissolves in water to give a solution of pH about 6, and does not release CO2 when solid sodium bicarbonate is added.
479 words, about 2 min5Risk Assessment for a Sucrose Dehydration Demonstration
A teacher plans a demonstration for 28 ninth graders: adding 30 mL of 18 M sulfuric acid to 20 g of sucrose in a 250 mL beaker on a hot plate to show the dehydration of sugar. The classroom has no fume hood, one window that opens, and a fire extinguisher 15 m down the hall.
423 words, about 2 min