Top articles

  • Photosynthesis and Chlorophyll

    24 avril 2012

    Photosynthesis is a process used by plants and other organisms to capture the sun's energy to split off water's hydrogen from oxygen. Hydrogen is combined with carbon dioxide (absorbed from air or water) to form glucose and release oxygenHP Pavilion dv6-1200eh...

  • Water

    26 avril 2012

    Water is a chemical substance with the chemical formula H2O. A water molecule contains one oxygen and two hydrogen atoms connected by covalent bonds. Water is a liquid at ambient conditions, but it often co-exists on Earth with its solid state, ice, and...

  • Aluminium And Lead

    27 avril 2012

    Aluminium is a silvery white member of the boron group of chemical elements. It has the symbol Al, and its atomic number is 13. It is not soluble in water under normal circumstances. Aluminium is the third most abundant element (after oxygen and silicon),...

  • Helium And Nitrogen

    02 mai 2012

    Helium is the chemical element with atomic number 2 and an atomic weight of 4.002602, which is represented by the symbol He. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table....

  • Lithium And Platinum

    03 mai 2012

    Lithium (from lithos, Greek for stone) is a soft, silver-white metal that belongs to the alkali metal group of chemical elements. It is represented by the symbol Li, and it has the atomic number 3. Under standard conditions it is the lightest metal and...

  • Carbon And Nitrogen

    04 mai 2012

    Carbon is the chemical element with symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. There are three naturally occurring isotopes,...

  • Silicon And Phosphorus

    08 mai 2012

    Silicon is a chemical element with the symbol Si and atomic number 14. A tetravalent metalloid, it is less reactive than its chemical analog carbon, the nonmetal directly above it in the periodic table, but more reactive than germanium, the metalloid...

  • Potassium And Calcium

    10 mai 2012

    Potassium is the chemical element with the symbol K (from Neo-Latin kalium) and atomic number 19. Elemental potassium is a soft silvery-white alkali metal that oxidizes rapidly in air and is very reactive with water, generating sufficient heat to ignite...

  • Titanium And Chromium

    11 mai 2012

    Titanium is a chemical element with the symbol Ti and atomic number 22. It has a low density and is a strong, lustrous, corrosion-resistant (including sea water, aqua regia and chlorine) transition metal with a silver color. Sony VAIO VPCF135Z1E/B battery...

  • Manganese And Cobalt

    14 mai 2012

    Manganese is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a free element in nature (often in combination with iron), and in many minerals. As a free element, manganese is a metal with important industrial...

  • Iron And Nickel

    15 mai 2012

    Iron is a chemical element with the symbol Fe (from Latin: ferrum) and atomic number 26. It is a metal in the first transition series. It is the most common element (by mass) forming the planet Earth as a whole, forming much of Earth's outer and inner...

  • Copper And Silicon

    18 mai 2012

    Copper is a chemical element with the symbol Cu (from Latin: cuprum) and atomic number 29. It is a ductile metal with very high thermal and electrical conductivity. Pure copper is soft and malleable; a freshly exposed surface has a reddish-orange color....

  • Harry Potter And Vampire

    21 mai 2012

    Harry Potter is a series of seven fantasy novels written by the British author J. K. Rowling. The books chronicle the adventures of a wizard, Harry Potter and his friends Ronald Weasley and Hermione Granger, all of whom are students at Hogwarts School...

  • Harry Potter And Vampire(2)

    21 mai 2012

    Folk beliefs See also: List of vampires in folklore and mythology The notion of vampirism has existed for millennia; cultures such as the Mesopotamians, Hebrews, Ancient Greeks, and Romans had tales of demons and spirits which are considered precursors...

  • Zinc And Gallium

    22 mai 2012

    Zinc, or spelter (which may also refer to zinc alloys), is a metallic chemical element; it has the symbol Zn and atomic number 30. It is the first element in group 12 of the periodic table. Zinc is, in some respects, chemically similar to magnesium, because...

  • Chromium And Arsenic

    23 mai 2012

    Chromium is a chemical element which has the symbol Cr and atomic number 24. It is the first element in Group 6. It is a steely-gray, lustrous, hard metal that takes a high polish and has a high melting point. It is also odorless, tasteless, and malleable....

  • Tin And Gold

    25 mai 2012

    Tin is a chemical element with the symbol Sn (for Latin: stannum) and atomic number 50. It is a main group metal in group 14 of the periodic table. Tin shows chemical similarity to both neighboring group 14 elements, germanium and lead and has two possible...

  • Qianlong Emperor And Kangxi Emperor

    30 mai 2012

    The Qianlong Emperor, born Hongli Chinese: 弘曆(Manchu language: ᡥᡠᠩ ᠯᡳ ;Möllendorff transliteration: hung li), 25 September 1711 – 7 February 1799) was the sixth emperor of the Manchu-led Qing Dynasty, and the fourth Qing emperor to rule over China proper....

  • Musée du Louvre And Chanel

    31 mai 2012

    The Musée du Louvre (French pronunciation: [myze dy luvʁ])—in English, the Louvre Museum or simply the Louvre—is one of the world's largest museums, the most visited art museum in the world and a historic monument. A central landmark of Paris, France,...

  • Bank And Pawn shops

    01 juin 2012

    A bank is a financial institution and a financial intermediary that accepts deposits and channels those deposits into lending activities, either directly or through capital markets. A bank connects customers that have capital deficits to customers with...

  • Dell And HP

    05 juin 2012

    Dell, Inc. (NASDAQ: DELL) is an American multinational computer technology corporation based in 1 Dell Way, Round Rock, Texas, United States, that develops, sells and supports computers and related products and services. Bearing the name of its founder,...

  • Knowledge of Snake

    08 juin 2012

    Snakes are elongate, legless, carnivorous reptiles of the suborder Serpentes that can be distinguished from legless lizards by their lack of eyelids and external ears. Like all squamates, snakes are ectothermic, amniote vertebrates covered in overlapping...

  • Frog And Owl

    11 juin 2012

    Frogs are amphibians in the order Anura (meaning "tailless", from Greek an-, without + oura, tail), formerly referred to as Salientia (Latin salere (salio), "to jump"). Most frogs are characterized by a short body, webbed digits (fingers or toes), protruding...

  • Knowledge of Cat

    12 juin 2012

    The domestic cat (Felis catus or Felis silvestris catus, informally Felis domesticus) is a small, usually furry, domesticated, carnivorous mammal. It is often called the housecat when kept as an indoor pet, or simply the cat when there is no need to distinguish...

  • Knowledge Of Dog

    13 juin 2012

    The domestic dog (Canis lupus familiaris), is a subspecies of the gray wolf (Canis lupus), a member of the Canidae family of the mammilian order Carnivora. The term "domestic dog" is generally used for both domesticated and feral varieties. The dog may...

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