NY Regents Chemistry case studies
NY Regents Chemistry · Put your knowledge to work in context.
The New York State Regents Examination in Chemistry - also called the Physical Setting/Chemistry Regents - is a New York State high school assessment in chemistry, administered by the New York State Education Department through its Office of State Assessment. It is intended for high school students who have completed a chemistry course aligned to New York State learning standards and who need the exam for a Regents diploma or as part of their science sequence. The NY Regents Chemistry case studies are 6 cases and about 3,816 words.
1Identifying a Metal from a Density Measurement
A student in a Regents chemistry lab is given a small, irregular piece of metal taken from a recycling bin. The electronic balance reads 23.45 g.
622 words, about 3 min2Assigning Third-Period Elements from Periodic Trends
Three unlabeled samples of third-period elements are on a lab bench. The labels were lost, but the instructor confirms the samples are sodium, magnesium, and aluminum.
705 words, about 4 min3Classifying Solids by Particles and Intermolecular Forces
Three unlabeled white solids are tested in a lab. Solid A melts at 801 °C, dissolves in water, and the resulting solution conducts electricity; when A is melted with a Bunsen burner, the melt also conducts.
670 words, about 3 min4Limiting Reactant and Percent Yield in a Gas-Collection Experiment
A student mixes 5.00 g of calcium carbonate with 50.0 mL of 1.00 M hydrochloric acid in an open flask. The reaction is CaCO3(s) + 2 HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l).
631 words, about 3 min5Le Chatelier and Energy in a Reversible Complex-Ion Reaction
A student prepares a pink aqueous solution of cobalt(II) chloride. The equilibrium is [Co(H2O)6]2+(aq) + 4 Cl−(aq) ⇌ [CoCl4]2−(aq) + 6 H2O(l), with the hydrated ion pink and the chloride complex blue.
595 words, about 3 min6Choosing a Radioisotope and Calculating Storage Time
A hospital pharmacy receives a shipment of iodine-131 with an initial activity of 800 MBq. Iodine-131 has a half-life of 8.0 days and emits beta particles and gamma rays.
593 words, about 3 min