Pure tungsten is a light gray or whitish metal that is soft enough to be cut with a hacksaw and ductile enough to be drawn into wire or extruded into various shapes. If contaminated with other materials, tungsten becomes brittle and difficult to work with. Tungsten has the highest melting point of all metallic elements and is used to make filaments for incandescent light bulbs, fluorescent light bulbs and television tubes. Tungsten expands at nearly the same rate as borosilicate glass and is used to make metal to glass seals. Tungsten is also used as a target for X-ray production, as heating elements in electric furnaces and for parts of spacecraft and missiles which must withstand high temperatures.
Applying The Law of Conservation of Mass to the Copper Cycle Clara Ramirez* Lab Partner: Manniah Harris Chemistry Lab 111 Section 529 Introduction: Copper is an abundant element found in nature as well as in a variety of different compounds. It is an excellent conductor of heat and electricity, hence it can be found in various industries. The purpose of the experiment was to demonstrate the copper cycle, in which copper metal would be transformed through a series of reactions and then recovered as solid copper. A percent yield for copper recovered was also calculated. The Law of Conservation of Mass will also be expressed during the experiment, as it states mass is neither gained nor lost in a chemical change.
Dr. Jefferson Andrews Chemical Principalities - CHEM 1101 1 October 2008 Copper, the Funnest Lab Ever. Abstract: This experiment served as a test of our individual laboratory skills in carrying out several Abstract: chemical transformations involving copper. The experiment was successful in that the Abstract: percent yield was reasonable, and we were able to recover our copper sample with Abstract: maximum efficiency ( we were able to recover all of the copper with which we began ). Introduction: This experiment involved the separation and purification of our desired product ( copper ) from any unwanted side products. This was accomplished using several different methods including filtration, sedimentation, decantation, extraction, and sublimation.
In 2400 B.C. to 1918 A. D. the Assyrians were a big part of the Middle East. Assyrian located in north Mesopotamia and spans four countries: In Syria, Turkey, and Iran and in Iraq. Assyrians made a huge cultural impact on the evolution of Mesopotamia. From being the first to use iron in their weapons, uses different techniques for war, to using things for different purposes; Assyrians were the strongest of their time.
A brief on Egyptian blue Egyptian blue (cuprorivaite, CaCuSi4O10) was the first synthetic pigment ever produced by man; it is considered a great technology development in ancient Egypt from the 4th Dynasty (c.2613–2494 BC) till the Roman times, this pigment appeared in Egypt during the 3rd millennium BC [6]. This pigment consists of calcium copper tetrasilicate (cuprorivaite, CaCuSi4O10), a blue tabular crystal about 15 μm to 30 μm in length, residual silica (quartz and/or tridymite) and an amorphous silica-rich phase. This synthetic pigment was making by mixing calcium salt (carbonate, sulphate or hydroxide), a copper compound (oxide or malachite), sand (silica) and an alkali flux (sources of alkali could either have been natron from areas
Pebble Mine The Pebble deposit is a massive deposit of gold, copper and molybdenum, located in the headwaters of the Kvichak and Nushagak Rivers. The Pebble Mine is an idea to set up a mine at those sites and take those resources out of the ground. If built, it would be one of the largest mines ever, measuring 2 miles wide and up to 2,000 feet deep. Like all other projects like this, the Pebble Mine has many pros as well as cons. One pro of this idea is that they construction of this mine and the mine itself will create thousands of new jobs.
Persian Empire The Persian Empire was one of not just a great military conquering empire but one of immense beauty and technological engineering of it’s kind and age. This empire was built on engineering feats never before seen from roadways to canals, to even finding water and filter water from rocks Persia was also ruled by some of the greatest kings of all time, from Cyrus the Great to Darius the III. This vast empire was ruled all the way from North Africa to Northern India or otherwise know as Asia minor. One of the first kings of Persia was Cyrus the Great. Cyrus knew that one thing they needed to become one of the greatest empires of all time was to be able to channel water to there empire, so Cyrus was the first to come up with the first way of getting water out of rocks.
These metals have only one electron in their outer shell. This means they are ready to lose that one electron in ionic bonding with other elements. As with all metals, the alkali metals are malleable, ductile, and are good conductors of heat and electricity. The alkali metals are softer than most other metals. Cesium and francium are the most reactive elements in this group.
In the 15th century, the Basque Country became the leading iron producing region of Spain and one of the most important in Europe. The shipbuilding industry was the largest in Spain and expanded considerably as commerce flourished. A strong legal framework and a broad array of schools and research centers emerged. Industrial activities were traditionally centered on steel and shipbuilding, mainly due to the rich iron ore resources found during the 19th century around Bilbao. The Estuary of Bilbao was the center of the Basque Country's industrial revolution during the 19th and the first half of the 20th century.
B. Reactions of Copper (II) Ions Reaction with: | Observations | Formula of copper-containing product | Equation for reaction | Oxidation state of copper in the product | (a) Sodium Sulphide (Na2S) | Black solid deposit, rotten smell | CuS | CuSO4 (aq) + Na2S (aq) → Na2SO4 (aq) + CuS (s) | +2