Chemical peel

0.20 g of adsorbent was added to 20 mL of 50 mg/L dye solution and Vortex at 150 rpm for various time intervals at 5, 10, 15, 30, 60, minutes. The above steps were repeated using dye concentrations of 100, 150 and 200 mg/L dye solutions. Adsorbent dosage is an important parameter because it determines the capacity of adsorbent for a given initial concentration of dye molecules. Then their % absorbance’s were calculated by spectrophotometer (λmax=410) and thus amount adsorbed were calculated.…

Our lives and the lives of those before us, have been unknowingly (or knowingly) shaped by elements. In The Disappearing Spoon, the author Sam Kean, discusses the wonderful world of the periodic table in depth. Within the first nine chapters of the novel, Kean explains the importance of location on the table, origin and discovery of each element, and its impact on other aspects of human life. Through various tales, the table is pulled apart and analyzed in an ingenious way. To a reader, it is…

org/pages/2572/Ester.html>. Romero, Maria Dolores et al. "Study of the Influence of Alsohols in the Synthesis of Short Chain Esters." Chemical Engeneering Transactions 24 (2011): 37-42. Silberberg. Principles of General Chemistry . Philippines: MC Graw Hill companies , 2010 . Zimmerman, Isaak. Organic Chemistry. Benziger Bruce & Glencoe, Inc, 1997. IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific…

7.59 From the stress–strain data for poly(methyl methacrylate) shown in Figure 7.24, determine the modulus of elasticity and tensile strength at room temperature [20°C (68°F)], and compare these values with those given in Tables 7.1 and 7.2. Solution From Figure 7.24, the elastic modulus is the slope in the elastic linear region of the 20C curve, which is The value range cited in Table 7.1 is 2.24 to 3.24 GPa (325,000 to 470,000 psi). Thus, the plotted value is a little on the…

Introduction Enzymes, which speed up a chemical reaction without being consumed or changing the products of the reaction, are very important because they control the cellular activity of all living organisms. Enzymes are also described as being “catalysts”. In biological systems, specific enzymes catalyze particular cellular reactions. Each enzyme has a unique 3-D shape, and this shape determines which reaction it catalyzes. However, in order for a chemical reaction to move forward, an energy…

In this experiment, the effects of environmental conditions on enzyme activity are explored. An enzyme is better known as an element produced by a living organism that acts as a catalyst to bring about a specific biochemical reaction. The environmental condition that was examined were the effects of temperature on enzyme activity. The raw materials that were used in this experiment were potato pile used to create catechol oxidase, catechol, and water which added as the solution. With Pipets and…

In this experiment, a series of reactions was performed in order to synthesize 6-ethoxycarbonyl-3,5-diphenyl-2-cyclohexenone, an a,b-unsaturated ketone. The two reactions performed in order to obtain this product were a Michael addition reaction and an Aldol condensation reaction. During this experiment, the reaction solution underwent several changes. Originally, the initial solution was light yellow and transparent. Once heated, the appearance of the reaction solution became bright yellow.…

Formal Lab Report: Molar Volume of a Gas at STP Abstract: The purpose of this experiment is to find out how to experimentally determine what the volume of a mole of H₂(g) is at STP by using gas laws. The hypothesis for the experiment is that if H₂(g) is produced at RT and STP, Avogadro’s law can be used to experimentally determine the amount of H₂(g) because equal gases at the same pressure and temperature have the same amount of particles. In order to find the molar volume, hydrogen gas…

The Old Lie: Dulce et Decorum Est Wilfred Owen had experienced first-hand the horrors of World War One, and watched as countless young lives were slaughtered believing “The old Lie: Dulce et decorum est” (27), that it was sweet and fitting to die for one’s country. He wrote the poem Dulce et Decorum Est to clearly refute the message espoused by many, that war is glorious, by bringing to life the horrors of warfare through vivid imagery. This was accomplished by exposing the gruesome conditions…

Short-term plasticity at the ORN  PN synapse could result in PN responses that are strongest during the rising phase of the ORN response since the ORN  PN synapses display short-term depression that causes ORN spikes that arrive later to produce smaller postsynaptic potentials than the ones produced by earlier spikes. In depressing synapses, successive action potentials result in smaller and smaller postsynaptic responses. The reduction in postsynaptic responses could be due to smaller amount…