Chemistry Essay Topics

The Decomposition of H2o2 Using Catalase

I also predict that at about 50i?? C the enzymes will start to become denatured which means that the key (the substrate) will not fit into the active site anymore i. e. I believe that this will happen because in Mackean’s it states “Above 50i?? C the enzymes, being proteins, are denatured and stop working…. View Article

Who have to deal with loss

These shoes are a symbol of the daughter, “One shoe pointed in fact towards the bedroom window… and the other pointed towards the door. They wanted to get out” The writer has used personification here to suggest how the mother is trying to figure out why her daughter has left her, just like in “Chemistry”… View Article

To Determine the Heat of Formation of Calcium Carbonate

A) In the 1st part, an accurately weighed known mass of anhydrous magnesium sulphate(VI) powder is added to known volume of deionized water. With the help of the data of temperature change during the addition, the molar enthalpy change of solution of anhydrous magnesium sulphate(VI) can be calculated. ( H1) B) In the 2nd part,… View Article

Analysis of Brick Cleaner

Aim: To find the percentage by mass of hydrochloric acid present in brick cleaner by doing an acid-base titration. Theory/Hypothesis: The main ingredient in brick cleaner is HCL and must be diluted and titrated with a base to be able to analyse it. It reacts with parts of the concrete which allows it to remove… View Article

Alkaloids Case Study

Alkaloids are the most diverse group of secondary metabolites and over 5000 compounds are known. They are most commonly encountered in the plant kingdom, but representatives have been isolated from most other orders of organisms ranging from fungi to mammals. For years, there has been interest in their pharmacological activities, and for a long time… View Article

Identification of an Organic Unknown

Introduction I am supplied with an unknown organic compound containing one of the following functional groups: * Alcohol * Aldehyde * Ketone * Carboxylic Acid * Ester * Phenol Organic compounds have different functional groups and therefore differ from each other. They also react differently, I will use this method to determine the type of… View Article

The Enthalpies of Combustion

Standard enthalpy change of combustion is the energy change that occurs when 1 mol of fuel is completely burnt in oxygen under standard conditions. However, it is impossible for substances to be burnt under standard conditions. The enthalpies of combustion are different depending on the number of carbons and hydrogens in each substance. For example,… View Article

Investigating the Volume of a Drop

Criteria: – Planning (a) – Planning (b) – Data Collection – Data Processing and Presentation – Conclusion and evaluation Laura Hu Lab Partner: Tu Tai Kuong Started January 20, 07 Completed January 27, 07 5 pages + raw data Planning (a) and (b) Objective: To accurately measure the volume of a drop of water and… View Article

To Determine Enthalpy Change of Hydration of Magnesium Sulphate(VI)

1) Experiment No: 8A 2) Objective: To determine the heat of formation of calcium carbonate. 3) Date: 26th Nov, 2010 4) Theory: The experiment consists of 2 parts: a) In the 1st part, an accurately weighed known mass of calcium is added to a given dilute hydrochloric acid. During the addition, the following occurs: Ca(s)… View Article

Chemical Effects of Electric Current

EXTRA QUESTIONS: Q. Why the bulb glows when the electric current passes through it? Ans. Due to the heating effect of current, the filament of the bulb gets heated to a high temperature and it starts glowing. Q. Write a short note on: (a) LED Ans. LED- Light Emitting Diodes are used for lighting. There… View Article

Quantitative Determination of Sulfate by Gravimetric Analysis

1. Synopsis: This report is written about determining the quantitative amount of sulphate inside barium sulphate, BaSO₄, using the method of gravimetric analysis. This quantitative determination is done by the addition of a dilute solution of barium chloride slowly to a hot unknown sulfate solution slightly acidified by concentrated hydrochloric acid, HCl. The white precipitate… View Article

Chemical Policy Regulation

The European Commission’s Registration, Evaluation and Authorisation of Chemicals (REACH) is a new system wherein manufacturers, distributors, and importers are required to sign-in their chemical inventories into a centralized database, along with information on physical and chemical properties, safe handling, hazards, and uses. Substances with carcinogenic, toxic, or mutagenic activity will require permission before being… View Article

Hydrogen Peroxide and Iodide Kinetics

(Be sure to state references for any cited value at the end of this report. Additionally, all report material must be in INK – pencil or white-out will render the work ineligible for mark appeal) 1.What observations and conclusions can you note about each of the three reactions that occurred in the test tubes where… View Article

Calorimetry

The purpose of this experiment was to find the specific heat formation of magnesium oxide by combining the two heat reactants using Hess’s Law. The purpose was also to measure the delta T which was the final temperature minus the initial temperature of the solution. The claim made was, based on the expected heat formation… View Article

Marie Curie – Change Agent

Marie Curie has been chosen as a change agent due to the fact that she was the first woman to win a Nobel prize. She studied radioactivity, “a term which she invented,” (1) and invented portable x-ray machines which were carried by vans to the wounded in the field during World War I. (2) Element… View Article