Chemistry Essays

I. Introduction Spectrophotometric measurements with UV or visible light radiation are useful in detecting transition metal ions and highly conjugated organic compounds. In UV and visible light regions, energy spaces molecules undergo electronic transitions. By comparing the spectrum of an analyte with those of sample molecules, you can get an …

Generally, there are two ways in preparing a solution, one is by dissolving a weighed amount of solid in a required solvent and the other is by dilution of a concentrated solution into the desired concentration. In diluting concentrated solution, the concentration of the diluted solution can be determined by …

HOW ARE REDOX REACTIONS DIFFERENT? Redox is the term used to label reactions in which the acceptance of an electron (reduction) by a material is matched with the donation of an electron (oxidation). A large number of the reactions already mentioned in the Reactions chapter are redox reactions. Synthesis reactions …

Describe the positive test for starch. Explain how you know. The positive test for starch is adding iodine solution. In the experiment, the starch solution had the most dramatic reaction with the iodine solution. It turned to an opaque bluish-purple solution while other samples all turned to a colour related …

Acetic Anhydride and p-Aminophenol were heated in a vial attached to an air condenser to synthesize crude acetaminophen, resulting in 0.097 grams (47.48% yield). The crude acetaminophen was then recrystallized in a solvent of water and methanol over heat resulting in 0.082 grams (39.61% yield) of pure acetaminophen. Melting points …

1.Describe two variables that affect the rate of diffusion. 2.Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction? 3.Describe the results of the attempts to diffuse glucose and albumin through the 200 MWCO membrane. …

Objectives: To show student how chemical reactions can react with one another to create totally new compounds. Liquids and solids can combine to create gasses with practical and fun applications. Materials: A litre-bottle, Cork (if cork doesn’t fit into bottle, either cut it, or place paper towels around it so …

In the separation and purification of a single protein or amino acids, a solution containing the desired analyte is passed through a column of ion exchange media, and the eluent checked to ensure that the desired component of mixture has bound to the column. The column is then washed with …

Titration is a method of chemical analysis that can be used to determine the amount of analyte present in the solution through the determination of the endpoint of the reaction (Dartmouth College, 2000). In the experiment, the percent composition of soda ash was determined. Soda ash could be composed of …

Abstract: During the experiment, the group were able to perform the following objectives; to compute the heat capacity of a Styrofoam-cup calorimeter, and also to compute the heat of neutralization of 1.0 M hydrochloric acid and 1.0 M sodium hydroxide, the heat of dilution of concentrated sulfuric acid, and the …