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The change from an A*-G grading system to a 9-1 grading system by English GCSE qualifications has led to a 9-1 grade International General Certificate of Secondary Education being made available. [13] Before, this qualification was graded on an 8-point scale from A* to G with a 9th grade “U” signifying “Ungraded”.
In India, GCSE can be used for comparison with class 12 and class 10 Board Examination which is usually taken in Class 10 and Class 12.The Board Exams are usually important for student who want to seek admission in India Along with Admission in college in UK as CBSE, ICSE-ISC are similar to GCSE .IGCSE Exams are also available in India for the ...
A chemical formula used for a series of compounds that differ from each other by a constant unit is called a general formula. It generates a homologous series of chemical formulae. For example, alcohols may be represented by the formula C n H 2n + 1 OH (n ≥ 1), giving the homologs methanol, ethanol, propanol for 1 ≤ n ≤ 3.
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22395-91-1 AlCl 2<F: aluminium chloride fluoride: 22395-91-1 AlClO: aluminium chloride oxide: 13596-11-7 AlCl 2 H: dichloroalumane: 16603-84-2 AlCl 3: aluminium chloride: 16603-84-2 AlCl 2 F: aluminium chloride fluoride: 13497-96-6 AlCl 3: aluminium trichloride: 7446-70-0 AlCl 4 Cs: aluminium caesium tetrachloride: 17992-03-9 AlCl 4 K ...
A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound, using chemical symbols for the chemical elements, and subscripts to indicate the number of atoms involved. For example, water is composed of two hydrogen atoms bonded to one oxygen atom: the chemical formula is H 2 O.
Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...
A Level module exams and courseworks are worth a set number of UMS marks. These modules and courseworks for a specific A Level combine to give a total UMS mark. For example, an A level Chemistry course might consist of 4 exams worth 90 UMS and 2 exams worth 120 UMS, totalling a maximum of 600 UMS.