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In August 2018, Ofqual announced that it had intervened to adjust the GCSE Science grade boundaries for students who had taken the "higher tier" paper in its new double award science exams and performed poorly, due to an excessive number of students in danger of receiving a grade of "U" or "unclassified".
AQA Education, [1] trading as AQA (formerly the Assessment and Qualifications Alliance), is an awarding body in England, Wales and Northern Ireland. It compiles specifications and holds examinations in various subjects at GCSE, AS and A Level and offers vocational qualifications. AQA is a registered charity and independent of the government.
Al(C 2 H 5) 3 + 9 C 2 H 4 → Al(C 8 H 17) 3 Al(C 8 H 17) 3 + 3O + 3 H 2 O → 3 HOC 8 H 17 + Al(OH) 3. The process generates a range of alcohols that are separated by distillation. Many higher alcohols are produced by hydroformylation of alkenes followed by hydrogenation. When applied to a terminal alkene, as is common, one typically obtains a ...
Ordinary distillation cannot produce alcohol of more than 95.6% by weight, which is about 97.2% ABV (194.4 proof) because at that point alcohol is an azeotrope with water. A spirit which contains a very high level of alcohol and does not contain any added flavoring is commonly called a neutral spirit. Generally, any distilled alcoholic beverage ...
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There is no international consensus on how much pure alcohol is contained in a standard drink; [2] values in different countries range from 8 to 20 grams (0.28 to 0.71 ounces). The example questionnaire form for the World Health Organization's Alcohol Use Disorders Identification Test (AUDIT) uses 10 g (0.35 oz), [ 3 ] and this definition has ...
Long chain oxo-alcohols are often prepared using alpha-olefins from the Shell higher olefin process, to give secondary alcohols such as isodecyl alcohol. [2] Key oxo alcohols that are sold in commerce include the following: 2-Methyl-2-butanol (2M2B) n-Butanol; 2-Ethylhexanol; 2-Propylheptanol; Isononyl alcohol; Isodecyl alcohol
C12-C13 alcohol glycidyl ether is a mixture of organic chemicals in the glycidyl ether family. [1] It is a mixture of mainly 12 and 13 carbon chain alcohols, also called fatty alcohols that have been glycidated. [2] It is an industrial chemical used as a surfactant but primarily for epoxy resin viscosity reduction. [3] [4] It has the CAS number ...