Hydrogen bond

The element Carbon is the fourth most abundant in the Universe. Here on Earth, Carbon is present in what we eat, in what we live and drive, and also in us. DNA is formed by two intertwined molecules around a Carbon chain. From the smallest protein chain in DNA to the largest mountain on the planet, Carbon is responsible for one of the most important cycles that allow humans to survive on Earth. The Carbon cycle is divided into Slow and Fast. During my lifespan, I will be able to directly affect…

following figures will show the change in the structure as the temperature increases. It can also be concluded T=465K T=659K T=759K T=865K T = 938K T=969K T = 1005K Another observation is that there is no significant change on the length between the bonds of the cell and the angle with the increase in temperature. However, it decreases slightly after the 980K transition. It can also be concluded from the ATOMS diagrams that the inverse relation between the tilt angle and the temperature. As the…

Abstract: We describe the successful synthesis of Polypyrrole-Gold nanocomposites (PPy-Au NCs) by the chemical oxidative polymerization of pyrrole with ferric chloride as an oxidizing agent, in the presence of a colloidal suspension of gold nanoparticles. Gold nanoparticles (Au NPs) were synthesized by standard citrate reduction method. Au NPs and PPy-Au NCs were characterized by Transmission Electron Microscopy (TEM), Atomic Forced Microscopy (AFM), Scanning Electron Microscopy (SEM), Fourier…

The main principle of manufacture of urea has two main reactions. 2NH3 + CO2 NH2COONH4 -37.4 Kcal/mol NH2COONH4 NH2CONH2 + H2O + 6.3 Kcal/mol While going main reactions, the undesirable side reaction taking place is 2NH2CONH2 NH2CONHCONH2 (Biuret) + NH3 This process is further complicated by the formation of a substance called biuret, NH2CONHCONH2, which should be kept low because it adversely affects the growth…

In Fig 4 pore size distribution profiles of the Y and MY is observed. By the BJH method, which uses desorption branch of the nitrogen isotherm in order to calculate the pore size distribution and the adsorbed volume[12], the pore size in the range of only 1.4 nm could be seen in Fig. 4a. Presence of various distribution of pore size is the manifest of the related BJH of the MY zeolite in Fig. 4b. As can be seen there are the pore size distributions from 1.2-6 nm in which the pores in the range…

Electrochemical Performance. To evaluate the electrochemical behaviors of the highly open framework of the as synthesized LTH on nickel foam electrodes NCA-L-@NF, NCA-L@G-NF and NCA-L@ BG-NF with three different feeding mole ratios , which is the best morphological foundation for fast redox reaction and charge accumulation, its potential application in high-performance supercapacitor has been investigated by cyclic voltammetry (CV), galvanostatic charge-discharge and electrochemical impedance…

I: Introduction: a. background information- Physical Changes are changes that do not involve a change in molecular structure. They can be identified by a change in size, a change in shape, or a change in the state of matter. Chemical changes are changes that involve the re-arrangement of atoms in the molecule. They can be identified by a color change, if a new gas is given off, if a precipitate or new solid forms, and if light, electricity, or heat is given off. b. observations- The observation…

Every element has its own symbol ,atomic number ,and atomic mass. The symbol is letters of the element, atomic number is the number of protons, and atomic mass is the mass of the element. The Symbol for Calcium is `Ca’ and the atomic number is 20, and the mass number is 40.078 u. Family. The periodic table is classified into groups and every group(row) has its own properties. Calcium is in group 2 ,and this is the second most reactive group of the periodic table. Each of the elements in…

or a mixture of esters and other substances to duplicate the odor and flavor of a particular fruit. Naturally occurring esters are found in fruits. An ester is a product of the reaction of an acid (carboxylic acid) and an alcohol (the hydrogen of the acid R-COOH is replaced by an alkyl group R'). Esters mainly result from the condensation (a reaction that produces water) of a carboxylic acid and an alcohol. The process is called esterification. This reaction can be catalyzed by the…

In this experiment, solid magnesium was conducted in a chemical reaction with hydrochloric acid solution. The three objectives include: measuring the gas production of a chemical reaction by a pressure change, determining the mass of the hydrogen gas produced in the reaction, and determining the effectiveness of the procedure by calculating the percent yield. In order to complete these objectives, a flask containing the magnesium ribbon was completely submerged into a large beaker filled with…