Chemistry Essays

The first discovery in chemistry, the discovery of oxygen by Joseph Priestley in the 1770s, started when scientists searched for “new air”” known as gas. Later, Antoine Lavoisier named it oxygen and described its role. The next discovery was the atomic theory by John Dalton, who at first called the …

Learning Objectives to understand the titration curves for the following solutions • a weak acid: acetic acid, CH3COOH. • • • • • a strong acid: hydrochloric acid, HCl. an acidic commercial cleanser. a basic commercial cleanser. to use the titration curves to calculate the percent of the active ingredients …

Aim: To determine the iron in natural water by spectrophotometry. Abstract: The iron in natural water was determined by utilizing spectrophotometric analysis. That was done by measuring the absorbance of five Fe(oPH)2+3 standards at 510 nm. From that information, a calibration curve was plotted and used to find the amount …

For determining purity of unknown KHP, acid – base titration was used. Molarity of titrant in this case NaOH was standardized as 0.04958(±0.00011) M. Purity of unknown KHP was calculated as 35.88(±0.16) %. Introduction Acid – base titration is typical method of determining unknown figures. Acid – base titration means …

Introduction Nowadays, even candles are expensive. Coconut (cocos nucifera) Oil is cheaper than paraffin wax (unnatural additive) that was used in making candles. Coconut oil is a fat consisting of about 90% saturated fat. The oil contains predominantly medium chain triglycerides, with roughly 92% saturated fatty acids, 6% monounsaturated fatty …

Minerals are naturally occurring chemical substances in the earth’s crust obtainable by mining. Out of many minerals in which a metal may be found, only a few are viable to be used as sources of that metal. Such minerals are known as ores. Examples: Galena, PbS, etc. It is usually …

Coagulation of protein refers to sticking together, like a blood clot, usually as a result of denaturation or coming out of solution due to abnormal ionic strength or a change of solvent. Definite characteristics of the proteins are changed when they are coagulated, among which is loss of solubility in …

Lab Safety: * Chemical Safety: watch out for any spills, keep the area clean * Heat Safety: stay at a safe distance from the flame * Sharp Object Safety: take caution when working with magnesium wire * Safety glasses: in case of splashes from the chemicals * Horseplay will not …

Learning Goals 1. To synthesize aspirin from salicylic acid and acetic anhydride. 2. To purify the crude product by Recrystallization. Introduction Most drugs are chemical compounds which are described as “organic compounds” because they are comprised primarily of the elements carbon, hydrogen and oxygen. The present experiment will be the …

In Vietnam, everyone studies literature, and their teachers give them many topics namely discuss folk literature, poem, and written literature. In high school, I wrote the essay about discussing the folk literature that the topic was: “Explain the folk-song of Vietnam: failure is the mother of success.” From this essay, …