mercury essays

mercury essays Mercurys symbol is Hg, its atomic number is 80, its atomic mass is 200.59, its in group 12 and in period 6, and it also has two valence electrons. Its standard state is liquid at 298K and it is the heaviest known elemental liquid. It has a silvery white color. It is named after the planet "Mercury" the origin of the symbol Hg is the Latin word "hydrargyrum" meaning "liquid silver". Mercury was known to ancient Chinese and Hindus before 2000 B.C. and was found in tubes in Egyptian tombs dated from 1500 B.C. Mercury is the only metal liquid at ordinary temperatures. Mercury is sometimes called quicksilver. It sometimes occurs free in nature and is found mainly in cinnabar ore, which is HgS. Cinnabar ore is found in Spain and Italy. Mercury is a heavy, silvery-white metal, which forms alloys easily with many metals like gold, silver, and tin. These alloys are called amalgams. Its way of amalgamating with gold is made use of the recovery of gold from its ores. Mercury is a bad conductor of heat and an okay conductor of electricity. The most important salts are mercuric chloride HgC12 that is a corrosive and violent poison. Mercurous chloride Hg2Cl2, which used to be used in medicine. Mercury fulminate Hg(ONC)2 used as a detonator in explosives and mercuric sulfide HgS used as a high-grade paint pigment. Organic mercury compounds are important and dangerous. Methyl mercury is a lethal pollutant found in rivers and lakes. Mercury is a virulent poison and is readily absorbed through the respiratory tract, the gastrointestinal tract, or through unbroken skin. It acts as a cumulative poison since there are few pathways available to the body for its excretion. Since mercury is a very readily vaporizable element at a relatively low temperature, dangerous levels are readily attained in air. Air saturated with mercury vapor at 20C contains a concentration that exceeds the toxic ...

10 Facts About the Geography of Baja California

10 Facts About the Geography of Baja California Baja California is a state in northern Mexico, the westernmost in the country. It encompasses an area of 27,636 square miles (71,576 sq km) and borders the Pacific Ocean on the west; Sonora, Arizona, and the Gulf of California on the east; Baja California Sur to the south; and California to the north. By area, Baja California is the 12th largest state in Mexico, which has 31 states and one federal district. Mexicali is the capital of Baja California, and more than 75 percent of the population lives in that city or in Ensenada or Tijuana. Other large cities in Baja California include San Felipe, Playas de Rosarito, and Tecate. Baja, California Facts The following is a list of 10 geographic facts to know about Baja California: It is believed that people first settled on the Baja Peninsula around 1,000 years ago and that the region was dominated by a few Native American groups. Europeans did not reach the area until 1539.Control of Baja California shifted between various groups in its early history, and it was not admitted into Mexico as a state until 1952. In 1930, the Baja California peninsula was divided into northern and southern territories. However, in 1952, the northern region (everything above the 28th parallel) became the 29th state of Mexico, while southern areas remained as a territory.The dominant ethnic groups in the state are white/European and Mestizo, or mixed Native American and European. Native Americans and East Asians also make up a large percentage of the states population.Baja California is divided into five municipalities. They are Ensenada, Mexicali, Tecate, Tijuana, and Playas de Rosarito.As a peninsula, Baja California is surrounded by water on three sides with borders on the Pacif ic Ocean and the Gulf of California. The state also has diverse topography but it is divided in the middle by the Sierra de Baja California, the Peninsular Ranges. The largest of these ranges are the Sierra de Juarez and the Sierra de San Pedro Martir. The highest point of these ranges and of Baja California is Picacho del Diablo at 10,157 feet (3,096 m). Between the mountains of the Peninsular Ranges are various valley regions that  are rich in agriculture. However, the mountains also play a role in Baja Californias climate, as the western portion of the state is mild due to its presence near the Pacific Ocean, while the eastern portion lies on the leeward side of the ranges and is arid through much of its area. The Sonoran Desert, which also runs into the United States, is in this area.Baja California is extremely biodiverse along its coasts. The Gulf of California and Baja Californias shores are home to one-third of Earths marine mammal species. California sea lions live on the states islands, while various types of whales, including the blue whale, breed in the regions waters.The main sources of water for Baja California are  the Colorado and Tijuana Rivers. The Colorado River naturally empties into the Gulf of California, but because of upstream uses, it rarely reaches the area. The rest of the states water comes from wells a nd dams, but clean drinking water is a big issue in the region. Baja California  has 32 universities with 19 serving as research centers in fields such as physics, oceanography, and aerospace.Baja California also has a strong economy and is 3.3 percent  of Mexicos gross domestic product. This is mainly through manufacturing in the form of maquiladoras. Tourism and service industries are also large fields in the state.