Physical chemistry

charged electrons. Here, the electrons represents the plume in the pudding of positive charge. Hence his model was known as plum pudding model. It was also known as watermelon model where the positive charge was the flesh of the watermelon and the electrons were the sects. a) J.J. Thomson who discovered the electron in 1897, proposed the plum pudding model of the atom in 1904 before the discovery of the atomic nucleus in order to include the electron in the atomic model. b) In Thomson’s model,…

• What are the strategic choices available? Biocon India Group is a Bangalore-based organization that began in 1978 with the enzyme business. An enzyme, by the way, is a substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction. That said, the Biocon India realized that growth is imminent and various strategic choices are available. The first strategic choice available to Managing Director, Kiran Mazumdar-Shaw’s Biocon India is expansion…

Paragraph 1 For α-Quartz, its lattice symmetry is trigonal, and for β-Quartz, its lattice symmetry is hexagonal. For α-FePO4, its space group is P3121 and thus its lattice symmetry can be inferred to be also trigonal, just like α-Quartz. Similarly, β-FePO4 space group is P6422 and its lattice symmetry can be inferred to be hexagonal, just like β-Quartz. Although the chemical structures of quartz and FePO4 are different, with quartz having a formula of SiO2, they can actually be in the same…

Introduction: Solubility is the “ability for a given substance, the solute, to dissolve in a solvent” . The effect of temperature on solubility is that when heat (energy) is added, it increases the speed on which molecules and particles move, therefore making it a quicker process. Where as with cooler temperatures there aren’t as many particles because the solvent doesn’t contain as much energy as warmer temperatures, therefore not dissolving as well as it could if it was warmer. To make jelly…

Chemical Reactions I Purpose The purpose of this experiment was to test and see how four different chemical reaction worked. The four different chemical reactions are formation, decomposition, single-replacement, and double-replacement. The hypothesis of this experiment was that in each of the different reactions something would happen to the reactant whether it be color, mass, temperature, or pressure. II Equipment For this experiment Late Nite lab was used. In Late Nite Lab the equipment…

of the iron phosphate depends on the temperature, whereby iron phosphate would be a beta-phase from an alpha-phase when temperature increases from low to high. Irregularity would also be affected by the change in temperature that is cause by non-physical behavior. When temperature gets higher, atoms of the structure moves vigorously that creates vibration and thus amplitude of alpha increases. As for tilting, it only changes the angle, but…

Synthesis ofp-[1-(p-Hydroxyphenyl)-1-(p-Methoxyphenyl)Ethyl]Phenol (HMEP) 0.2 mol of phenol was mixed with the solution containing 100 mL of acetic acid in 200 mL of concentrated hydrochloric acid in 500 mL five necked round bottom flask fitted with anoil bath, thermometer, mechanical stirrer, reflux condenser. The contents of the flask was stirred for a period of 15 min, the solution was heated to 65oC, 0.1 mol ofp-methoxyacetophenone was introduced into a dropwise to the solution for about 6 h…

Atoms and Mocules I. Aim: - To determine the definition of atoms and molecules and the difference of those notions. - Understanding isotopes, atomic mass, and molecular mass. - Understanding mole concept and molar mass. III. Definitions: 1. Atoms: According to Dalton’s atomic theory, atoms are the basic units of matter and the defining structure of elements. Atoms are made up of three parts: protons (positively charged), neutrons (uncharged) and electrons (negatively charged). For…

INTRODUCTION 1.1What is an acid-base titration? An acid –base titration is the determination of the concentration of an acid or base by neutralizing the acid or base with an acid or base of known concentration. An acid-base titration is the analysis of the concentration of acids and bases; through this process an acid or base of known concentration neutralizes an acid or base of unknown concentration. The neutralization of an acid or base in acid-base titration can be measured with either a…

III. RESULTS AND DISCUSSIONS: A. Characteristics of Aluminum-Graphite composites and the in-situ reaction To examine the reaction condition of carbon flakes and Al powders, 4 wt. % carbon flakes were added to Al powders. Fig. 1 shows the DSC plot obtained during heating and cooling of the green compact from room temperature to 750 0C and from 750 0C to room temperature at a heating/cooling rate of 3 0C /min under argon gas atmosphere. From the DSC heating curve it is evident that the total…