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Chemistry Essay Examples

Factors affecting Osmosis in Potato Tissue

We will connect the calibrated gas syringe to the side armed flask. We will place the strip of magnesium ribbon into the side armed flask at the same time as putting in the bung and starting the stop clock. We will time how long the reaction takes until it is stopped and record the results….

Chromatography and Solvents

Chromatography is a method of separating compounds and mixtures so that they can be identified and analyzed. The word chromatography means color writing. There are many kinds of chromatography such as the thin layer chromatography, Partition chromatography, Column chromatography, and Paper chromatography. Chromatography is important in the analysis of processes and materials such as environmental…

Specific heat capacity is ethanol

The three variables that affect the specific heat capacity of a substance are:  emperature change (K) or ( c) The equation that is used to determine the specific heat capacity of any substance is; Specific Heat Capacity = Energy Supplied ( Q) (C) Mass (kg) Temperature Change ( ) Unit: Jkg- K- Each different substance…

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The reaction between zinc and copper sulphate

To investigate the affect of varying the amounts of zinc in the reaction between zinc and copper sulphate has on the rate of reaction. Background Knowledge My experiment is based on the theory of: ‘A more reactive metal can displace a less reactive metal from a compound’ For examplThis type of reaction is known as…

The heat energy produced by propanol

The energy released by a fuel depends on two things. Firstly the number of bonds to be broken and made and secondly the type of bonds involved. Therefore from the preliminary work I can see that propanol has similar type bonds to ethanol, but it has more of them. This means that proponal will use…

Magnesium oxide

I can’t have only 1 point connecting to zero to make a line of best fit because it would not be a very reliable line. Analysis The type of graph I have is as straight line in a positive correlation. The results are directly proportional which means as the mass of magnesium goes up, the…

Measuring the specific heat capacity of water

Introduction The Specific Heat Capacity of any substance can be defined as the amount of energy needed to raise 1kg of the substance by 1i?? c. It’s found by using the following formula: C = Q / (M x ? ?) Where (C) represents the SPHC; (Q) the energy needed or given out in joules;…

The hydrogen peroxide

The substances that I am going to use in this investigation are Manganese Dioxide and Hydrogen Peroxide. The Manganese Dioxide is a chemical catalyst and will be used to speed up the breaking down of Hydrogen Peroxide. I am using a chemical catalyst because it would give a more accurate result compared to organic or…

Boiling Water, Condensation and Dissolving.

“The purpose of teachers’ questions should be to promote children’s activity and reasoning” (up 41 ) which Is why It Is up to the teachers of today to establish an understanding of the different sorts of questions that can be used to get different sorts of responses from the children that would Initiate participation In…

Acids, Bases & Buffers

To measure the buffering capacity of two types of Isotonic drinks. Introduction: There are acid-forming. Basic forming and neutral food, however the acid or alkaline properties of a food is unable to judge by the actual acidity of the food itself. For example, citrus fruits such as lemon are acidic, but they are alkaline-forming when…

Quizlet

Group of atoms that link together and have the same function Examples of national groups hydroxyl, carbonyl, amino, phosphate, slothfully what is an isomer? Give two examples of isomers.. When a chemical formula is the same but arrangement is different. Ex. ) Structural isomer or Optical isomer what is the difference between structural or optical…

Sodium Borohydride Reduction: Diphenylmethanol from Benzophenone

Megan Entwistle, Maria Amos, and Paul Golubic CHEM 0330 Organic Lab 1 Sodium Borohydride Reduction: Diphenylmethanol from Benzophenone 11/16/11 Introduction Redox (shorthand for REDuction-OXidation) reactions are chemical reactions in which the oxidation state (or oxidation number) of atoms has changed. Oxidation can be observed through the loss of electrons or an increase in oxidation state…

Specific Heat Capacity

In this experiment, we are going to use a calorimeter (a solid metal block of aluminium). And we are going to expose it to different temperatures and measure the difference in temperature over time. We will also measure the changes in electric properties from the heater over time: Volts and Amperes. In order to get more…

Isolation and Analysis of Essential Oils Using Gas Chromatography

Isolation and Analysis of Essential Oils using Gas Chromatography Lyndon Justin T. Guzman Institute of Chemistry, University of the Philippines, Diliman, Quezon City Date Performed: February 2; February 4, 2011 Date Submitted: February 18, 2011 Abstract The purpose of this experiment is to isolate the essential oil from eucalyptus leaves as a pure compound; moreover,…

Chemistry Notes

Chemistry 200 Exam 1 Review Problems 1. Calculate the number of atoms in 10. 0 grams of Fe. 2. Give the mass number, #protons, #neutrons and #electrons for the isotope strontium-88. 3. Calculate the number of moles of carbon in 50. 0 g of benzene C6H6 4. A substance is found to be 38. 7…

The Arrhenius Equation and Activation Energy

In this lab, our task is to determine how different degrees of temperature affect reaction rates. A Swedish chemist, named Svante Arrhenius discovered the relationship between temperature and reaction rate. In finding this relationship a new equation was formed called the Arrhenius Equation: Reaction rate constant k = A e -Ea/RT The factor A represents the frequency of…

Preparation of 2-Acetylcyclohexanone

Introduction3 Results4 Discussion6 Conclusion7 Experimental7 References8 Preparation of 2-Acetylcyclohexanone Introduction When hydrogens are present on the ? -carbon of ketones (like the reaction used in this experiment), carbonyl compounds and aldehydes, they turn the compound slightly acidic1. These functional groups are removed by using a basic solution as shown in (i) below1. The product formed…

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,…

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…

Determination Of The Valency Of Magnesium

1. To determine the stoichiometry of the magnesium 2. To study the quantitative relations between amounts of reactants and products of the reaction. Theory & Background : Stoichiometry is the study of the combination of elements in chemical reactions. Stoichiometry refers to the relative number of atoms of various elements found in a chemical substance…

Determining the Molecular Weight of a Volatile Liquid

In today’s society, many products are designed to undergo many chemical reactions before the desired product(s) is created. This principle, also known as chemical synthesis, is an integral part in the operation of products such as an automobile airbag. Beginning with the releasing of nitrogen gas to inflate the bag and ending with the production…

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…

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