The Magnesium Statue
Planning
The Problem
A statue, which is made of an alloy consisting mainly of magnesium,
corrodes at different rates, at different times of the year.
Background Knowledge
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There are some areas of knowledge that should be taken into
consideration to help in devising an experiment to help determine the
cause of the problem, and which gave me a greater understanding of the
problem.
A major factor in the decay of the statue is acid rain, which prevents
the formation of the oxide coat that would normally form on magnesium
preventing corrosion in air. Rain is naturally acidic, due to the CO2
dissolved in it, however when sulphur dioxide and oxides of nitrogen
react with the rain water they form sulphuric, and nitric acids which
make the rain strongly acidic.
SO2 + ½O2 + H2O → H2SO4
It may also take the form of snow or fog. The sulphur dioxides and
oxides of nitrogen come mainly from industry. Acid rain is currently a
subject of great controversy because of widespread environmental
damage for which it has been blamed, including eroding structures,
injuring crops and forests, and threatening or depleting life in
freshwater lakes. However the 1990 amendments to the Clean Air Act of
1967 put in place regulations to reduce the release of sulphur dioxide
from power plants to 10 million tons per year by January 1, 2000. This
amount is about one-half the emissions of 1990.
But still it shall be the rate of reaction that changes the speed of
the statues decay, and chemical kinetics, the study of reaction rates,
shows that three conditions must be met at the molecular level if a
reaction is to occur:
· The molecules must collide;
· They must be positioned so that the reacting groups are together in
a transition state between reactants and products;
· And the collision must have enough energy to form the transition
state and convert it into products.
This last condition is referred to as the activation energy, there
These two statues are famous to the Egyptian art era. They represent the woman’s position and the man’s position at that day and age. Traditionally, the rulers of Egypt were male. So, when Hatshepsut, Dynasty 18, ca. 1473-1458 B.C., assumed the titles and functions of king she was portrayed in royal male costumes. Such representations were more for a political statement, rather than a reflection of the way she actually looked. In this sculpture, she sits upon a throne and wears the royal kilt and the striped nemes (NEM-iss) headdress with the uraeus (cobra) and is bare chested like a man. However, she does not wear the royal beard, and the proportions of her body are delicate and feminine.
The Broadway Fountain located in Madison, Indiana is a famous artistic structure that is well known for its historical background and current use as an ideal location of weddings and other gatherings. In the course of a little over a century, the fountain has been in danger of being completely discarded twice and has been replaced with an exact bronze replica. Designed by French sculptor J. P. Victor Andre, the original Broadway Fountain was presented to the city of Madison in 1886 after being featured in the 1876 Philadelphia Centennial Exposition (National Park Service).
The Ancient Egyptian sculpture, “Statue of Nykara and His Family”, was sculpted during the late fifth dynasty. The sculpture is a depiction of Nykara, his wife, Nubkau, and son, Ankhma-Re. The statue is in poor condition with pieces of limestone missing and chips on the three subject’s faces and bodies. The painted limestone shows the conventional colors for the male and female subjects. There is a clear discoloration among Nykara and his son’s bodies. The brownish red color they once were has eroded to a light yellowish color, which resembles the purposeful color of Nykara’s wife. The hieroglyphs on Nykara’s seat insinuate that the sculpture is meant to be viewed from the front view. This is also evident by the way the three subjects are facing forward in frontal view. There are hieroglyphs on both the chair and base of the statue near Nykara’s wife and son’s feet.
The statue of Hatshepsut seated down is made with the material limestone. This limestone is lightly colored, which created a larger contrast with the other statues nearby. Her face was carved bringing out her eyes, eyebrows and other facial features. Her eyebrows also come slightly together towards the middle. Her lips forming a slight archaic smile. The dimensions are larger than an average female size. The statue is of great size, yet still in proportion. The body and head fit well with each other overall. However, it is greatly exaggerated in size.
Primo Levi’s personal relationship to his profession as a chemist shows that philosophically and psychologically, he is deeply invested in it. His book THe PeriOdic TaBLe shows that his methodology cannot be classified as either purely objective or purely subjective. He fits into the definition of dynamic objectivity given by Evelyn Fox Keller in her book Reflections on Gender and Science.
The statue titled, Torso of Venus, was a replica of the original work by Praxiteles. The Romans made the sculpture in 1st or 2nd century AD during the time of the Late Antiquity period; more specifically known as the Pre-Constantine period. Like the original, the statue was made out of marble. The Torso of Venus is a statue of the goddess Venus, known commonly as the goddess of love and beauty. It was said that she was born, or emerged, from the sea foam. Venus, or Aphrodite to the Greeks, was the embodiment of beauty, sexuality, love and fertility. I believe the Torso of Venus was the Roman version of “Aphrodite of Knidos”, which was one of the most famous works of the ancient Greek sculptor Praxiteles of Athens in the 4th century BC.
ABSTRACT: Plato’s best-known distinction between knowledge and opinion occurs in the Meno. The distinction rests on an analogy that compares the acquisition and retention of knowledge to the acquisition and retention of valuable material goods. But Plato saw the limitations of the analogy and took pains to warn against learning the wrong lessons from it. In this paper, I will revisit this familiar analogy with a view to seeing how Plato both uses and distances himself from it.
The first step that we took to accomplish our goal was to put on our safety goggles and choose a lab station to work at. We received one 400ml beaker, one polyethylene pipet, two test tubes with hole rubber stoppers, two small pieces of magnesium (Mg), one thermometer and a vial of hydrochloric acid (HCl). We took the 400ml beaker and filled it about 2/3 full of water (H20) that was 18 OC. Then we measured our pieces of Mg at 1.5 cm and determined that their mass was 1.36*10-2 g. We filled the pipet 2/3 full of HCl and poured it into one of the test tubes. Then, we covered the HCl with just enough H2O so that no H2O would be displaced when the stopper was inserted. After inserting the stopper, we placed the Mg strip into the hole, inverted the test tube and placed it in the 400ml beaker. HCl is heavier than H2O, so it floated from the tube, into the bottom of the beaker, reacting with the Mg along the way to produce hydrogen gas (H2). We then measured the volume of the H2, cleaned up our equipment and performed the experiment a second time.
This essay is all about the Element Magnesium. Magnesium is one of the wider known Elements from the periodic table and, as stated in the following essay, is very good for the human body, especially the muscles. It is also one that has been put in to a few different forms to be easier to take as a supplement. This is one of the points discussed in the following essay, as well as these other points; the history of Magnesium and its discovery, places you will find it such as food or other sources, its uses, plus potential health benefits and harms.
Alkylated phenols and their derivatives are important materials in both organic synthesis and chemical manufacturing. Mono-alkylphenols and di-alkylphenols are used as raw materials for the manufacture of a wide variety of products such as resins, wire enamels, varnishes, printing inks, antioxidants, flame retardants, ultraviolet absorbers, fungicide, petroleum additives and rubber chemicals [1-17]. Friedel–Crafts alkylation of phenol with tert-butyl alcohol (TBA) produces 2-tert-butylphenol (2-TBP), 4-tert-butylphenol (4-TBP), 2,4-di-tert-butylphenol (2,4-DTBP), 2,6-di-tert-butylphenol (2,6-DTBP) and tert-butylphenol ether (TBPE), depending on both the catalyst and the reaction conditions. Based on previous researches, it is well known that moderate acid catalysts or high reaction temperature led to carbon alkylated products and TBPE is produced in the presence of weak acidic catalysts as a major product. 2-TBP is the jarless product of alkylation of phenol with TBA owing to the presence of phenolic (–OH) group on the aromatic ring that kinetically favours o-alkylation. However, due to steric hindrance, thermodynamically unfavoured o-isomer (2-TBP) is readily isomerized into less hindered p-isomer (4-TBP), especially in moderate acidic media. If strong acid catalysts are used in the alkylation reaction, 2,4-DTBP is a dominant product [17,18]. 2,4-DTBP is used in the manufacture of its triphosphite and benzotriazole, which are employed as a co-stabilizer for PVC or UV absorbers in polyolefins [12,13]. 2-TBP is an intermediate for pesticides, fragrances and antioxidants [14]. High selectivity toward 4-TBP is favored since this product imparts enhanced properties to the class of metallic detergents (phenates) used in lubricating oil...
The large kneeling statue of Hatshepsut (~1470 BCE), (Figure 3-21 [pg. 70] in “Art Through the Ages”) depicts the female pharaoh Hatshepsut, seated on her knees with a jar in each hand.
Uranium was discovered by Martin Heinrich Klaproth, a German chemist, in the mineral pitchblende (primarily a mix of uranium oxides) in 1789.Klaproth, as well as the rest of the scientific community, believed that the substance he extracted from pitchblende was pure uranium, it was actually uranium dioxide (UO2). After noticing that 'pure' uranium reacted oddly with uranium tetrachloride (UCl4), Radioactivity was first discovered in 1896 when Antoine Henri Becquerel, a French physicist, detected it from a sample of uranium. Today, uranium is obtained from uranium ores such as pitchblende, uraninite , carnotite and autunite as well as from phosphate rock , lignite (brown coal) and monazite sand . Since there is little demand for uranium metal, uranium is usually sold in the form of sodium diuranate , also known as yellow cake, or triuranium octoxide).
Sodium is an element on the periodic table with the chemical symbol as Na. Sodium, discovered by the English Chemist Sir Humphry Davy, is in the Alkali Metals group on the Periodic Table and it is a soft, silver/white color. Sodium, which is found in the Earth's crust, is important to society.
Metals possess many unique fundamental properties that make them an ideal material for use in a diverse range of applications. Many common place things know today are made from metals; bridges, utensils, vehicles of all modes of transport, contain some form of metal or metallic compound. Properties such as high tensile strength, high fracture toughness, malleability and availability are just some of the many advantages associated with metals. Metals, accompanied by their many compounds and alloys, similar properties, high and low corrosion levels, and affects, whether negative or positive, are a grand force to be reckoned with.