This document is an instructional module package prepared in objective form for use by an instructor familiar with the operation of an ion exchange softening system. It includes objectives, an instructor guide, student handouts and transparency masters. This is the third level of a three module series. This module considers the theory of ion…

We present calculations of ion-atom collisions using a partial-wave expansion of the projectile wavefunction. Most calculations of ion-atom collisions have typically used classical or plane-wave approximations for the projectile wavefunction, since partial-wave expansions are expected to require prohibitively large numbers of terms to converge…

Vanillin, the compound responsible for the well-known vanilla aroma, is almost exclusively produced via a chemical process, with only a small fraction extracted from natural sources, namely, the bean of the orchid "Vanilla planifolia". Research is being done towards a green chemistry process to obtain natural vanillin. A model biotechnological…

Presents an undergraduate quantitative analysis experiment, describing an atomic absorption quantitation scheme that is fast, sensitive and comparatively simple relative to other titration experiments. (CS)

We have designed a laboratory curriculum using the green and red fluorescent proteins (GFP and RFP) to visualize the cloning, expression, chromatography purification, crystallization, and protease-cleavage experiments of protein science. The EGFP and DsRed monomer (mDsRed)-coding sequences were amplified by PCR and cloned into pMAL (MBP-EGFP) or…

This report contains recommendations on chemical nomenclature, guidance on symbols, and terminology and units for physiochemical quantities. This report, intended to provide guidance to science teachers, consists of eleven sections: (1) general introduction; (2) introduction to symbols, terminology, and units for physiochemical quantities; (3)…

The existence of solvated electrons has been known for a long time. Key methods for their production (i.e., photoionization of reducing ions, water radiolysis, and the reaction between H[middle dot] and OH[superscript -]) are unsuitable for most school laboratories. We describe a simple experiment to produce liquid ammonia and solvated electrons…

Emphasizes recent advances in principles and methodology in ion exchange and chromatography. Two tables list representative examples for inorganic ions and organic compounds. Cites 544 references. (CS)

The experiment described here for advanced inorganic chemistry undergraduate students includes a solvolysis reaction of [CoCl(NH[subscript 3])[subscript 5]][superscript 2+] in nonaqueous (H[subscript 3]PO[subscript 4]) medium, followed by an alternative way of using ion-exchange chromatography based on the capability of changing the charges of the…

Presents an undergraduate experiment that uses ion-exchange techniques to recover the silver chloride precipitate from argentimetric determinations of chloride ions. (MLH)

Presents a detailed procedure for finding an empirical formula from ion exchange chromatography and colorimetry. Introduces students to more varied techniques including volumetric manipulation, titration, ion-exchange, preparation of a calibration curve, and the use of colorimetry. (JRH)

Describes the separation of proteins from bovine serum and egg-white using carboxymethyl cellulose, Vistec C1. Explains the preparative work that is essential before the technique can be employed. (GS)

Describes the plan submitted by the Nuclear Science Advisory Committee to the Department of Energy and National Science Foundation urging construction of an ultrarelativistic heavy-ion collider designed to accelerate nucleon beams of ions as heavy as uranium. Discusses the process of selecting the type of facility as well as siting. (JM)

Ionic bonding is a fundamental topic in high school chemistry, yet it continues to be a concept that students struggle to understand. Even if they understand atomic structure and ion formation, it can be difficult for students to visualize how ions fit together to form compounds. This article describes several engaging activities that help…

Describes an experiment that utilizes an acidic ion-exchange-chromatography column to separate two cobalt complexes. (MLH)