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Edexcel (also known since 2013 as Pearson Edexcel) [2] is a British multinational education and examination body formed in 1996 and wholly owned by Pearson plc since 2005. It is the only privately owned examination board in the United Kingdom. [3] Its name is a portmanteau term combining the words education and excellence.
David A. Evans (January 11, 1941 – April 29, 2022) [1] [2] [3] was an American chemist who was the Abbott and James Lawrence professor of chemistry at Harvard University. [4] [5] He was a prominent figure in the field of organic chemistry and his research focused on synthetic chemistry and total synthesis, particularly of large biologically active molecules.
The BTEC is another Level 1/2 qualification available in the same territories as the GCSE, and is graded at 5 levels. At Level 2, comparable to A*, A, B, and C respectively are the Distinction*, Distinction, Merit, and Pass. A BTEC at Level 1 is simply marked as "Level 1", with no subdivision. Below that level, a U is awarded, as in GCSEs.
The notion of precipitation can also be extended to other domains of chemistry (organic chemistry and biochemistry) and even be applied to the solid phases (e.g. metallurgy and alloys) when solid impurities segregate from a solid phase.
In chemistry, a pure element means a substance whose atoms all (or in practice almost all) have the same atomic number, or number of protons. Nuclear scientists, however, define a pure element as one that consists of only one isotope. [18] For example, a copper wire is 99.99% chemically pure if 99.99% of its atoms are copper, with 29 protons each.
Chemistry: A European Journal is a weekly peer-reviewed scientific journal that covers all areas of chemistry and related fields. It is published by Wiley-VCH on behalf of Chemistry Europe. The editor-in-chief is Haymo Ross. According to the Journal Citation Reports, the journal has a 2022 impact factor of 4.3. [1]
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