Abstract The experiment investigated the use of 31P NMR spectroscopy to determine the structure of polyphosphate anions. The structures of two cyclic (P4O124- and P3O93-) and two linear (P3O105- and P2O74-) were found. Introduction Phosphorus (V) has many polyphosphate oxo-anions which usually existing as either linear or cyclic phosphates. It is known that the linear phosphates are of the form [PnO3n+1](n+2)- and the cyclic phosphates in the form [PnO3n]n- (1). Two of these were synthesised: P3O105- and P4O124- using the […]
Abstract: The purpose of this experiment is to determine the rate constant and activation energy in the first step of the methanolysis of diethyl succinate. The rate constant is determined by analyzing the amount of diethyl succinate present in the reaction mixture at different times in a Gas Chromatogram. The k1 at 50 degrees Celsius was .0298 while the k1 at 60 degrees Celsius was .0332. Introduction: Gas Chromatography can be used to analyze the kinetics of a reaction that […]
Enzyme Kinetics- Determination of the Kinetic Parameters for Tyrosinase By: Trevor Frisby & David Darby Abstract In this Kinetics laboratory experiment the enzyme tyrosinase was investigated in the presence of two types of inhibitors: sodium cyanide and a synthesized inhibitor, dimethoxy azo-stilbene. Tyrosinase, also known as monophenol monooxygenase utilizes oxygen for the catalysis of two separate reactions that involve the hydroxylation of monophenols to diphenols, and also the oxidative conversion of diphenols to quinones. Through these chemical pathways tyrosinase catalytically […]
IDENTIFICATION OF STEREOCHEMICAL (GEOMETRICAL) ISOMERS OF [Mo(CO)4(L)2] BY IR SPECTROSCOPY. INTRODUCTION Metal carbonyl complexes are of interest in inorganic chemistry as they are good starting materials for many low oxidation state compounds. They are very reactive and lose one or more CO ligands upon heating, photolysis, exposure to other radiation, partial oxidation etc. They react with Lewis bases to form closed shell compounds and can also form clusters. Phosphine complexes (as in this experiment) are also used in many catalytic […]
Identification of Solid Unknown 18 S Solubility Test Results: Because unknown 18 S was soluble in NaOH but not in NaHCO3, it could be determined that the unknown compound was a phenol. Classification tests were performed to ensure the compound was a phenol. Classification Test Results: The classification tests performed confirmed that Unknown 18 S was a phenol. Both tests for the phenol functional group yielded a positive result. Possible Compounds: Derivative: 4-nitrophenol α-Naphthylurethane derivative Observed MP 149.6ºC Literature MP […]
Herbicide Effects of Trifluralin and N-(n-butyl)-2,4-Dinitroaniline Herbicide Solutions Introduction The purpose of this lab is to test the potency of trifluralin and N-(n-butyl)-2,4-Dinitroaniline as herbicides and the resistance of velvetleaf and crabgrass against them. This procedure consists of soaking crabgrass and velvetleaf seeds in various concentrations of the herbicide solutions and analyzing results after at least five days have passed. Dinitroaniline herbicides were first discovered in 1964. They function by inhibiting cell division in the root cells of susceptible weeds, […]