The biggest difference from all the previous compounds is that sodium hydroxide is highly corrosive, this is the reason it was given the name caustic soda. This compound is soluble in water, ethanol, and methanol. Sodium hydroxide is made by using the chloralkali process which is an industrial process. Sodium Chloride is then electrolyzed and sodium hydroxide is made in the cathode. A cathode is a type electrode where electrons move.
Mercury was first distinguished as an element by the French chemist Antoine Laurent Lavoisier in his experiment on the composition of air. At room temperature mercury is a shining, moving liquid that has a silvery-white color, and slightly volatile. Mercury remains a liquid over a wide temperature range. Mercury is a solid when given a pressure of 7640 atmospheres (5.8 million torrs). It dissolves in nitric or concentrated sulfuric acid but is resistant to alkalies.
C) Germanium, brittle silver element predicted in 1871 by Mendeleev but not discovered until 1886 by Clemens Winkler. It is used as superconductor in electronics; window and lens component in equipment to measure infrared radiation; component of camera lenses and microscopes; and in transistors and in phosphors for fluorescent lamps. It is found as a part of the minerals argyrodite, germanite, and renierite and in coal. It can kill certain harmful bacteria without causing toxicity to humans and is being studied as a therapeutic agent. Properties of Germanium Symbol Ge Atomic number 32 Atomic weight 72.59 Group in periodic table IVa Boiling point 4,892o F (2,700o C) Melting point 1,719o F (937.2o C) Specific gravity 5.323
Iodine equally exhibits numerous unfamiliar but vital commercial purposes. The basic characteristics of iodine are like that of other halogens on the periodic table, but with some conspicuous differences. Iodine is rated among most memorable and striking of all the chemical elements. When in its solid form, iodine appears as a grayish-black, heavy steel compound, but when subjected to combustion, the solid iodine sublimes, as opposed to melting; hence, sublimation refers to the direct transformation of a solid element into a gaseous state. The sublimed iodine vapor exhibits a violet color coupled with a strong odor.
Thorium and Uranium are the only actinides which occur naturally in the earth's crust.T Thorium With atomic number of 90, Th has a melting temperature of 1750˚C and a density of 11725 kg/m ᵌ. Uranium U is considered as the heaviest naturally occuring element, with a nucleus that draws its core electrons shells in closer to it because it is so full of protons and neutrons. This makes the relativistic effect to occur. This effect affects the electron orbital energies that the inner electrons will rotate in a fast manner towards th nucleaus to shield it better. As a result, the outer valence orbitals will be shielded and expanded, forming hybrid molecular orbitals.
Mercury Mercury’s 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 298ºK 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.
2.4.1 Peroxide based Bleaching Agents These products usually contains hydrogen peroxide or one of its precursors as an oxidizing agent a. Hydrogen peroxide (HP,H2O2) is an effective bleaching agent. It is a pale blue liquid and is slightly more viscous than water. The molar mass of hydrogen peroxide is 34.0147g/mol .As the molecular weight of hydrogen peroxide is low it can penetrate dentin and break the bond of organic and inorganic compound inside the dentinal tubules .The photolysis of hydrogen peroxide can only be achieved by low frequency light of wavelength 365nm or less and heat[37, 38]. b. Sodium perborate (NaBO3) is odorless, white, water soluble powder.
It is also a diprotic acid, with the first stage of ionization, H2SO4 → H+ + HSO4- HSO4- → H+ + SO4-2 Some physical properties that sulphuric acid has are: • Melting Point: 10.3 degrees • Boiling Point: 338 degrees • Formula weight: 98.08 • Specific gravity: 1.94 • Flash point: none • Density: 1.84g/cm3 Sulphuric acid is also a oxidizing agent as well as a drying agent because of its properties with water. The properties it has with water is that it is able to remove the water molecules from any many organic compounds. Manufacture Sulphuric acid is produced by dissolving sulphur trioxide (SO3) in water (H2O). SO3 + H2O → H2SO4 The nitrogen dioxide produced is then used with sulphur dioxide. The two ar... ... middle of paper ... ...nd eyes and leaving burns on the skin.
According to Porth 2011, “Graves disease is a state of hyperthyroidism, goiter, opthalmopathy or less common dermopathy… Graves disease is an autoimmune disorder characterized by abnormal stimulation of the thyroid gland by thyroid-stimulating antibodies.” (p.789). Some more causes include multi nodular goiter, adenoma of the thyroid and thyroiditis. (Porth, 2011, p.788). Some common symptoms of hyperthyroidism are tachycardia, sweating, increased sensitivity to heat, fatigue, and muscle weakness and enlarged thyroid gland.
Plutonium Plutonium is a radioactive metallic element. Although it is occasionally found in nature, mostly all of our plutonium is produced artificially in a lab. The official chemical symbol for plutonium is Pu, coming from its first and third letters. Its atomic number is ninety-four. Plutonium is able to maintain its solid state until very high temperatures, melting at six hundred and forty degrees Celsius, and boiling at three thousand four hundred and sixty degrees.