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Chemistry Essay Examples

Synthesis and Characterization

  Insert the tube into the MSB and take a mental average of the fluctuating reading. 5. Repeat the previous step three times. 6. If the MSB displays a negative number, the coordination complex is diamagnetic and no further steps are necessary. 7. Determine how many unpaired electrons reside on the cobalt. E. Interpreting Infrared…

Synthesis of chloropentaaminecobalt(lll) chloride

  Insert the tube into the MSB and take a mental average of the fluctuating reading. 5. Repeat the previous step three times. 6. If the MSB displays a negative number, the coordination complex is diamagnetic and no further steps are necessary. 7. Determine how many unpaired electrons reside on the cobalt. E. Interpreting Infrared…

The final product

Abstract: In this experiment three Werner complexes, hexaamminecobalt(III) chloride, pentaamminechlorocobalt(III) chloride and hexaamminenickel(II) chloride were synthesized so their structural formula could be examined through magnetic susceptibility, electronic conductance measurements and the analysis of free chloride in the two cobalt complexes through titrations of silver nitrate. Cobalt (III) coordination compounds usually only form in low spin,…

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Effect of Mno2 on the Decomposition of Hydrogen Peroxide

Chemistry Catalyst Report Aim I am trying to investigate the effect of the mass of magnesium dioxide used on the speed of the reaction of 2H2O2(aq) ? 2H2O(l) + O2(g). I hypothesize that the speed of the reaction is proportional to the rate of decomposition. Independent Variable The mass of MnO2 used Dependent Variable The…

Analysis of Silver in an Alloy

Analysis of Silver in an Alloy Introduction In this experiment an alloy of silver will be analyzed to determine its silver content. The silver-copper alloy will be dissolved in nitric acid, the silver will be precipitated as silver chloride, and the silver chloride will be filtered, washed, dried and its mass determined. From the mass…

Complexometric Determination of Water Hardness

ABSTRACT The average concentration of CaCO3 obtained was 212 ppm, with a standard deviation of 1 ppt. The results indicate that the unk B tap water can be considered as hard water. INTRODUCTION Hard water is due to metal ions (minerals) that are dissolved in the ground water. These minerals include Ca 2+, Mg2+, Fe3+,…

Quantitative Analysis by Spectrophotometric Methods

Abstract In this experiment, the absorbance of KMnO4 was measured by spectrophotometric method to determine the molar concentration and the molar extinction coefficient of KMnO4. In part 1, in order to determine the maximum absorbance wavelength of KMnO4, we measured the absorbance of the sample solution which contains KMnO4 at the wavelengths between 330nm and…

Synthesis of 7.7-Dichlorobicyclo [4.1.0]Heptane – Phase Transfer Catalysis

Abstract The preparation of 7. 7-dichlorobicyclo [4. 1. 0]heptane which is also known as 7,7-dichloronorcarane was done by reacting cyclohexene , chloroform and a base( 50% aqueous sodium hydroxide) with benzyl triethylammonium chloride. The latter being a water soluble phase transfer catalyst (PTC). reaction was performed at room temperature and was distilled at atmospheric pressure….

Flame Test

Title: Flame Test Aim: To determine the cation in each of the unknown substance X, Y and Z by observing the flame colour of different metal compounds. Introduction: A distinctive feature of many s-block metals is their ability to produce flame colours. At temperature of a Bunsen flame, a compound will decompose to give gaseous…

Surface tension of water

The capillary rise method was used to measure the surface tension of aqueous solutions of sodium chloride and acetic acid. Molar concentrations of 0. 5 M and 1. 0 M for each solution were tested. The results were then compared to the surface tension of pure water to observe how solute properties affect the surface…

Product and Purification and Infrared spectrum of trimyristin

Trimyristin is one member of a class of triglycerides which is found in animals’ fatty tissues and vegetable or marine oils. It can dissolve in organic compound such as hot acetone readily as it is a non-polar compound. After the isolation of tirmyristin from nutmeg seed by solvent extraction followed by recrystallizaiton, the present of functional…

Determination of the Enthalpy for Decomposition of Hydrogen Peroxide

Determination of the Enthalpy for Decomposition of Hydrogen Peroxide Objective: To construct a coffee cup calorimeter, measure its calorimeter constant, and determine the enthalpy of decomposition and formation of hydrogen peroxide. Background: This experiment is a classic thermodynamics lab. In it, we attempt to measure the enthalpy (? H) of a chemical reaction. The main…

EDCI Assignment 3

Chapter 1 Chemistry 1201/1202 Give the chemical symbol or name for the following elements, as appropriate: (a) sulfur, (b) magnesium, (c) potassium, (d) chlorine, (e) copper, (f) F, (g) Ni, (h) Na, (i) Al, (j)Si Question 1.13 Make the following conversions: (a) 62 degree Farenheit to Celsius, (b) 216.7 degree Celsius (c) 233 degrees Celsius…

The environmental factors that effect turnip peroxidase

The changing of pH, substrate concentrations, temperature, and an inhibitor (Niacin) and the effects it hade on the enzyme turnip peroxides. Enzymes are biological catalysts which increase reaction rates by lowering the activation energies of substrates. A substrate is a reactant that interacts with the enzyme. The enzyme and substrate can be viewed as the…

Ionic Reactions Lab

Ocean County College Department of Chemistry Chem 180 Lab 5: Ionic Reactions Submitted by Abstract: The purpose of this experiment is to work with aqueous solutions of ionic substances. Aqueous solutions are those solutions in which water is the solvent. When ionic substances are dissolved in water, the ions separate and become surrounded by water…

Advantage of Internet

1 Organic Chemistry 261(270, 271) Midterm-I Examination September 29, 2008 Name (print) ———————–ID No. ————————– Time: 50 minutes Total number of pages: 6 Answer all questions in the space provided. Question I. (15. 0) II. (14. 0) III. (14. 0) IV. (15. 0) V. (10. 0) Total (68. 0) Percentage Mark GOOD LUCK 2 (9….

Liquid Phase Chemical Reactors

It is also used in the laboratories in obtaining design, interpretation of rate of reaction and numerical treatment of kinetics experimental data for different types of reacting systems. The use of a batch reactor for the most part eliminates the effects due to fluid flow on the resulting reaction rates. Consequently, the data reflect the…

Factors Affecting Chemical Equilibrium

What Factors Affect Chemical Equilibrium? Introduction: In investigation 14, ‘What Factors Affect Chemical Equilibrium? “, the purpose was to find out which reagents caused a change in the chemical equilibrium. A deep red color was formed when Iron Nitrate (aqua)l was mixed with water and Ammonium Technocratic [NCSC (aqua)]. The product of these two reactants…

Lab Report on Ideal Gas Law

We then poured the water back into the test tube and placed the tube into the bucket with the opening upwards, turning the open end downwards after the tube was fully submerged beneath he surface. We then placed the canister directly below the opening of the test tube, and released the gas so that the…

Standardization Chemistry Lab Report

To be able to prepare standard solutions. To determine the strength of a given solution of Hydrochloric acid (HCI) To analyze errors that occur during standardization experiments. Introduction: A standard solution can be defined as a solution that contains a precisely known concentration of a substance. Concentration refers to the abundance of a substance in…

Lab Report: Gas Laws

Obtain a reference of pressures effects on gas using Bole’s law using a gas sample of standard “air” within a syringe and measuring pressures increase and decrease in association to changing volume. Measurements are obtained through microbial sensors and graphed using microbial software where a correlation coefficient of P vs… IN can be determined to…

Grignard Synthesis of Triphenylmethanol Lab Report

A Grinded reagent is a type of ergonomically, which consists of a bond twine a metal and a carbon. There are three types of carbon-metal bonds: ionic, polar covalent, and covalent. The ionic bonded compounds (example: RNa) have a weak bond between the carbon and the metal, and are therefore not useful because they are…

Chemical Bonding

Chemical compounds are formed by the joining of two or more atoms. A stable compound occurs when the total energy of the combination has lower energy than the separated atoms. The bound state implies a net attractive force between the atoms … a chemical bond. The two extreme cases of chemical bonds are: Covalent bond:…

Copper Iron Stoichiometry Lab Report

The two possible balanced reactions are – Cuscus (aqua) + Fee(s) Cue(s) + Feces (aqua) [I] cuscus (aqua) + fee(s) ICC(s) + [II] Through the possible reactions, one of the best way to determine which one is the correct reaction pertaining to the lab is limiting reagent analysis, where mass of copper is quantitatively determined…

Copper Cycle Lab Report

In conclusion my percent recovery of copper was 100% due to the adequate amounts of solutions and achievement of proper chemical reactions. Equipment and Materials: Copper Metal (penny) Nitric Acid (HON..)(aqua) Sodium Hydroxide (Noah)(aqua) sulfuric ACid Ammonium Hydroxide (NH)(aqua) Hydrochloric Acid (HCI)(aqua) Zinc powder 2 100 ml Beakers 250 ml Waste Beaker 400 ml Beaker…

Investigatory Project Homemade Bouncy Polymer

One might think that chemists are a bunch of boring scientists who wear lab coats and look at beakers all day, but did you know that many toys you play with are made using chemistry?Some of your favorite toys like Gak, Slime and Silly Putty started out as chemistry experiments. In fact, some of your…

Lab Report Gas Diffusion

A lump of sugar added to a cup f black coffee eventually dissolves and then diffuses uniformly throughout the coffee. Perfume presents a pleasant fragrance which is imparted throughout the surrounding atmosphere. These are examples of mass transfer. Mass transfer plays a very important role in many industrial processes: the removal of pollutants from plant…

Fractional Distillation Organic Lab Report

If such ideal conditions are not possible as is usually the case”then simple distillation can be applied as long as he liquid in question is composed of compounds that differ in volatility such that their boiling points differ by at least 40 to 50 degrees Celsius. Because the very essence of simple distillation is relies…

Osmosis Potato Lab Report Biology

If the two solutions are of equal concentrations, they will be isotonic. If the concentrations are unequal, the solution with the higher concentration is hypersonic, and the solution with the lower concentration is hypotonic. What is the solute concentration of potatoes? We can determine this by conducting an experiment in which involves the process of…

Lab Report Boiling Point and Melting Point

Should be based on observations made during the experiment. Evaluation of laboratory exercise type: On a separate page, each student should write a brief comment regarding 1) which lab method you prefer (inquiry-method, i. E. Problem-solving oriented, or traditional lab. Like this one. 2) group size (individual labs or small-group labs) 3) report writing –…

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