Chemical Essay Examples

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Anti Head Lice

Abstract. The present study focused on the separation and identification of the active compounds against head lice from the hexane extract of Annona squamosa L seed. Chromatographic and spectroscopic techniques revealed that two major compounds of the hexane seed extract were oleic acid and triglyceride with one oleate ester. The yields of these compounds were…

Enzyme Activity Lab

Hypothesis: 1) If the disk is placed into each beaker with 100 units/ml of enzyme solution, then the time for the disk to float will be 30 seconds. 2) If the temperature of the solution is at 5 degrees Celsius, then there will be less enzymes binding to the active site, and if temperature is…

Introduction to Chemical Engineering

Chapter 1: Introduction to Chemical Engineering Profession Teach (T) Students are exposed to a topic. No explicit learning objectives. No major activities such as assignments, exercises of projects. No assessment is linked to this topic. Use (U) There is an explicit learning objective. Compulsory activities such as assignments, exercises or projects are specifically linked to…



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Case study of the old family bank

Macro The major problem presented in this case is that The Grayson Chemical Company is experiencing a decline in earning and sales. The board of directors of the company has brought in a new company president to help in turning things around for the company. The new president now faces the enormous task of returning…

Extended Experimental Investigation

Abstract: Cold packs are based on the principle of endothermic reactions, which means a reaction that absorbs heat from the surrounding resulting in a temperature drop. Due to this temperature drop, cold packs have many benefits when it comes to injuries such as sprains and strains. It cools the local tissue and reduces bleeding, swelling…

Hydrogen Peroxide and iodine ions

The reason for the blue-black complex is due to the formation of polyiodide chains during the reaction between starch and iodine. The amylose in starch forms helices with which the iodine molecules align, causing a transfer of charge. This charge transfer corresponds to the absorption spectrum, in which the blue-black colour is the complementary colour….

Determining the Stoichiometry

1.) On graph paper, plot the milliliters of reactant #1 versus volume of precipitate for each reaction. For the copper chloride graph, draw the two best-fit straight lines through the data points and determine their point of intersection. Cu:PO4 stoichiometric ratio = 3:2 Balanced Equation = 3CuCl2 + 2Na3PO4 Cu3(PO4)2 + 6NaCl 2.) For the…

Advancement in Science and Technology Research is a peer-reviewed open access journal published quarterly

Advancement in Science and Technology Research aims at providing a platform for researchers, engineers, scientists, and educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal’s objective to promote engineering and technology education. The papers for publication in…

ATomic Review Sheet

3 The atomic mass of an element is the weighted average of the masses of (1) its two most abundant isotopes(3) all of its naturally occurring isotopes (2) its two least abundant isotopes(4) all of its radioactive isotopes 4 Which statement is true about the charges assigned to an electron and a proton? (1) Both…

SCH4U Exam Study Notes

Electron configuration: notation that shows number and arrangement of electrons in its orbitals Infinite number of electron configurations because infinite values of n For each atom, all but one of these represents the atom in an excited state Atom’s chemical property mainly associated with its ground state electron configuration Unless otherwise stated, assume electron configuration…

Computerized Data Acquisition of a Second Order Reaction

The rates at which reactions occur depend on the composition and the temperature of the reaction mixture. Usually the rate of reaction is found to be proportional to the concentrations of the reactants raised to a power.1 There are many reactions that have a rate law in the form of: (1) v = k[A]a[B]b According…

Boiling point is the temperature at which the vapor pressure

Boiling point is the temperature at which the vapor pressure of the liquid is equal to the external pressure on the liquid and the liquid changes into a vapor. Melting point is the temperature at which the lattice is collapses and the solid is converted into liquid. The trend in structure is from the metallic…

U.S. Involvement in Syrian Uprising

The Syrian civil war, also known as the Syrian uprising, began on March 15, 2011. Ever since, it has been a growing armed conflict between supporters of the Ba’ath government, and rebel groups wishing to abolish it. It all began when protesters demanded the resignation of Syrian President Bashar al-Assad. Because the Syrian President declined…

Percent Yield of Calcium Carbonate

The purpose of this experiment is to examine the percent yield of a precipitate in a double displacement reaction. A solution of calcium citrate and sodium carbonate were mixed together, then the products were filtered out as so only the precipitate remained. The filtered paper was then dried and the mass of the precipitate in…

Privately-owned Critical Infrastructure

One privately owned infrastructure critical to the United States are chemical facilities. “The majority of Chemical Sector facilities are privately-owned: requiring DHS to work closely with the private sector and its industry associations to identify and prioritize assets, assess risk, develop and implement protective programs, and measure program effectiveness” (Department of Homeland Security, n/d, pg….

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