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Oxford, Cambridge and RSA Examinations[2] (OCR) is an examination board that sets examinations and awards qualifications (including GCSEs and A-levels). It is one of England, Wales and Northern Ireland 's five main examination boards. OCR is based in Cambridge, with an office in Bourn, Coventry. It is part of the University of Cambridge 's ...
Currently, there are five exam boards available to state schools: AQA (Assessment and Qualifications Alliance) CCEA (Council for the Curriculum, Examinations and Assessment) OCR (Oxford, Cambridge and RSA Examinations) Pearson, under its Edexcel brand. WJEC (Welsh Joint Education Committee), under its WJEC and Eduqas brands.
A past paper is an examination paper from a previous year or previous years, usually used either for exam practice or for tests such as University of Oxford, [1][2] University of Cambridge [3] College Collections. Exam candidates find past papers valuable in test preparation. Some organizations responsible for holding exams have made past exam ...
The O grade was equivalent to a GCE Ordinary Level pass which indicated a performance equivalent to the lowest pass grade at Ordinary Level.. Over time, the validity of this system was questioned because, rather than reflecting a standard, norm referencing simply maintained a specific proportion of candidates at each grade, which in small cohorts was subject to statistical fluctuations in ...
Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.
The A-level (Advanced Level) is a subject-based qualification conferred as part of the General Certificate of Education, as well as a school leaving qualification offered by the educational bodies in the United Kingdom and the educational authorities of British Crown dependencies to students completing secondary or pre-university education. [1]
Ethylenediaminetetraacetic acid (EDTA), also called EDTA acid after its own abbreviation, is an aminopolycarboxylic acid with the formula [CH 2 N(CH 2 CO 2 H) 2] 2.This white, water-insoluble solid is widely used to bind to iron (Fe 2+ /Fe 3+) and calcium ions (Ca 2+), forming water-soluble complexes even at neutral pH.
In organic chemistry, a dithiocarbamate is a functional group with the general formula R2N−C (=S)−S−R and structure >N−C (=S)−S−. It is the analog of a carbamate in which both oxygen atoms are replaced by sulfur atoms (when only 1 oxygen is replaced the result is thiocarbamate). Dithiocarbamate also refers to the dithiocarbamate ion ...