1 mole of any substance can be defined as: Amount of a substance that contains as many particles (atoms‚ molecules or ions) as there are atoms in 12 g of the 12C isotope Avogadro number or Avogadro constant (NA); equal to 6.022 × 1023 particles Example − 1 mole of oxygen atoms = 6.022 × 1023 atoms 1 mole of carbon dioxide molecules = 6.022 × 1023 molecules 1 mole of sodium chloride = 6.022 × 1023 formula units of sodium chloride Molar mass of a substance can be defined as: Mass of one mole
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[Kr]4d55s1 Mo. Metal Molybdenum is solid with a density of 10.2g/cm3‚ its boiling point is 4912 K or 4639°C which is 8382°F in fahrenheit‚ and its melting point 2896 K or 2623°C and 4753°F in fahrenheit. There are 24 isotopes‚ although 7 are naturally occurring isotopes;92Mo (14.8%)‚ 94Mo (9.2%)‚ 95Mo (15.9%)‚ 96Mo (16.7%)‚ 97Mo (9.6%)‚ 98Mo (24.1%) and 100Mo (9.6%). It is a metal and at room temperature water and oxygen don’t react with the element. It is a natural element which could be obtained
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Surname Centre No. Initial(s) Paper Reference 4 3 3 5 Candidate No. 2 H Signature Paper Reference(s) 4335/2H Examiner’s use only London Examinations IGCSE Team Leader’s use only Chemistry Paper 2H Higher Tier Wednesday 17 June 2009 – Morning Time: 2 hours Materials required for examination Nil Items included with question papers Nil Question Leave Number Blank 1 2 3 4 5 6 7 8 9 Instructions to Candidates In the boxes above‚ write your centre number‚ candidate number‚ your surname
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power and cause breakage of macro molecules. Man-made sources of radiation pollution are mining and refining of plutonium and thorium‚ production and explosion and nuclear weapons‚ nuclear power plants and fuels and preparation of radioactive isotopes. There are commonly three types of radiation‚ namely: Alpha particles‚ can be blocked by a piece of paper and human skin. Beta particles can penetrate through skin‚ while can be blocked by some pieces of glass and metal. Gamma rays can penetrate
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resolution mass spectrometry. Gives you relative molecular weight of compound and also molecule composition. Parts of molecule can fragment (break off) in mass spectrometry so can get various peaks. Know stability of carbocations Isotope effect: Certain atoms have isotopes i.e 35Cl‚ 37Cl Therefore can get two
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The film‚ “Moche Human Sacrifice” discusses the investigation of a Moche site with a significant amount of human remains. John Verano‚ a forensic anthropologist‚ set out to learn about the Moche’s victims. He and his team knew to start looking based on depictions of sacrifice and torture in pottery art. The team found numerous victims in mass graves. Some bodies had evidence of their throats being slit‚ some were decapitated‚ and some were covered in cuts. At first glance‚ the human remains found
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The PET scan‚ or Positron Emission Tomography‚ was born in 1973 at Washington University. It was created by Edward Hoffman‚ Michael M. Ter-Pogossian‚ and Michael E. Phelps; Phelps is most often credited with the invention (History of PET and MRI‚ 2009). In preparation for a PET scan‚ radioactive tracers are injected into the body‚ inhaled‚ or ingested by the patient through a solution that they drink. Then the scan will actually begin‚ as the patient lies on a table‚ which glides into the machine
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- - Name: - Teacher: - Scientists: Ernest Orlando Lawrence Andre-Marie Ampere Subject: Physics Class: 12A Due Date: 20th August 2012 Name: - Teacher: - Scientists: Ernest Orlando Lawrence Andre-Marie Ampere Subject: Physics Class: 12A Due Date: 20th August 2012 Physics ERT: Magnetism Physics ERT: Magnetism Table of Contents Table
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Neon Have you ever known that behind those older television set screens that there were Neon tubes inside? Ever since it was discovered‚ Neon has become more and more popular. From TV tubes to Cryogenics to Neon signs to even lasers. Neon has been a vast element that can be used widely because of its unique chemical and physical properties. Neon has many interesting properties and they include: Neon’s atomic number is ten. It has an atomic mass of roughly 20.180. Represented with the symbol Ne. Neon
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Elements. His theory was that there are eight electrons in the outer orbit of an atom. He also postulated the electron pair relationship of acids and bases that is known as the Lewis theory of acids and bases. In 1933‚ he started his research on isotope
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