This article presents and discusses the results of a study that investigates university students’ comprehension concept molar concentration, following teaching evaluation subject. The specific problems underlying learning this have not yet been focused on in sufficient detail or depth. A “Reasoning with molarity” questionnaire, which explores logical–mathematical relationships between variables...

in recent years, ionic liquids have been used in pharmaceutical processes. therefore, having a deep insight into the ion association behavior of ionic liquids in the presence of a drug is of particular importance. so, in this work, the molar conductivities of the ionic liquids, 1-alkyl-3-methylimidazolium bromide, [cnmim]br (n = 4, 6 and 8) in various concentrations of aspirin (asa) in acetonit...

The slurry polymerization of ethylene was studied by employing a (TiCl4/Mg(OEt)2/TEA) catalyst system in hexane. The effects of triethylaluminum concentration and temperature on polymer yield and polymer viscosity average molecular weight, Mv, were investigated. The maximum polymer yield was obtained at an Al/Ti molar ratio of 124. The highest yield and Mv were achieved at 60 °C. The concentrat...

First, the authors should specify the exact meaning of “concentration” when this word is used within the manuscript, since density, molar fraction or mixing ratio are all measurements of concentration with different physical definitions. In this sense, it is important to realize that molar fraction should correspond to the molar ratio of carbon dioxide with reference to dry rather than moist ai...

using low-cost feedstocks such as rendered animal fats in biodiesel production willreducebiodieselexpenditures. one of the low-cost feedstocksfor biodiesel production could be the fatextracted from poultry feathers producedin slaughterhouses abundantly. this paper describes a new andenvironmentally friendly process for developing biodiesel production technology from feather waste producedin pou...