A simple tea infuser is obtained and been used as a container for the dry ice to simulate the effect from high-density dry ice. The tea infuser is a simple, low cost device to allow instructors with access to dry ice makers to effectively use the interesting demonstration.

The development of a simple spectro photometric method to quantitatively determine the quantity of FD&C color additives present in powdered drink mixes, are focused by the investigations. Samples containing single dyes of binary mixtures of dyes can be analyzed using this method.

A procedure by which the reactions are used to quantitatively determine the amount of total acid, the amount of total ascorbic acid and the amount of citric acid in a given sample of powdered drink mix, are described. A safe, reliable and low-cost quantitative method to analyze consumer product for acid content is provided.

Voltammetry principles are introduced to students by means of a bipotentiometric method to determine vitamin C in fruits and vegetables. The aim is to draw attention to voltammetric methods, particular to the study of current-potential curves, stressing the potential applicability in areas of food quality control.

A member of a related genus of the valerianaceae, Centranthus ruber, is used, that yields a higher percentage valtrate than other related species such as "Valeriana officinalis," there by making easier isolation in pure form.

A student procedure focusing on multistep sunscreen synthesis and spectroscopic analysis is reported. A two-step synthetic pathway towards sunscreens, an analog of a commercially available UV light blocker is designed, given the current high profile nature of skin cancer and media attention towards sunscreens.

Some Wittig reactions can be carried out by grinding the reactants in a mortar with a pestle for about 20 minutes, as per investigation. A laboratory experiment involving a solvent-free Wittig reaction that can be completed in a three-hour sophomore organic chemistry laboratory class period, are developed.

A molecule possessing other functional groups that could be hydrogenerated is examined, where a variety of metal catalysts are evaluated under similar reaction conditions. Optimizing organic reactions is both time and labor intensive, and the use of a combinatorial parallel synthesis reactor was great time saving device, as per summary.

The unique experience of designing and conducting a reaction are afforded to the students in a similar way to what one would do in a research lab. It encouraged them to think about each procedural step and its purpose, by the discovery-based procedure.

The lab experiment described starts from the principles developed by Sensel and Myers, but the experimental procedure are modified to provide a more reliable experiment assessment. The mass transfer equation is solved and all the involved parameters are calculated by a simple, numerical method.

A partnership is formed between the University of Pennsylvania and local elementary, middle and high schools in West Philadelphia, with the general goal of creating mutually beneficial science partnership between K-12 schools and colleges and universities. Access to expertise and resources not ordinarily available are given to West Philadelphia…

The call for implementation of inquiry-based teaching in secondary classrooms has taken on a new sense of urgency, hence several instructions models are developed to assists teachers in implementing inquiry in their classrooms. The role of knowledge and beliefs in inquiry teaching are examined.

The use of knowledge space theory (KST), to assess students' understanding and integration of the different representations in an introductory chemistry course are described. KST is a useful tool for revealing various aspects of students' cognitive structure in chemistry.

Volatile organic sulfur compounds (VOSCs) have been assigned environmental roles in global warming, acid precipitation, and cloud formation where two important members dimethyl sulfide (CH3)2 S, DMS, and methanethiol, CH3SH, MT, of VOSC group are involved.

Activities in which students explore the fundamental reasons behind the unusual instability of the trans isomers in medium-sized cycloalkenes by using the results of molecular modeling are described. Exercises have been proposed to explore the structures of cycloheptene and cyclooctene by Hehre and others which would be helpful to disabuse…