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"Ten Year Series (TYS)" is a term used by Singaporeans, in particular students, to refer to official compilation books of examination papers in past years for the General Certificate of Education (GCE) Normal Level (N-level), Ordinary Level (O-level) and Advanced Level (A-level), approved by the Singapore Examinations and Assessment Board (SEAB) and University of Cambridge Local Examinations ...
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.
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 number of subjects previously offered exam papers and syllabuses unique to Singapore, but these have since been retired or planned to be phased out. After taking O-levels, some Singapore students go on to GCE Advanced Level exams, which are also marked by Cambridge International Examinations .
This is a list of important publications in chemistry, organized by field. [1] [2] [3] [4]Some factors that correlate with publication notability include: Topic creator – A publication that created a new topic.
The examination board was established as The Joint Examinations Board for the General Certificate of Education at a meeting at Merchant Taylors' Hall, London on 8 May 1953. By December, it had changed its name to The Associated Examining Board for the General Certificate of Education after complaints that its name was too similar to the Joint ...
In 1901, Edgar Wedekind published the synthesis of alkyl ketene dimers by the reaction of carboxylic acid chlorides with tertiary amines: [5] [6] RCH 2 COCl + R 3 N → RCH=C=O + R 3 NHCl The molecular weight determined by the early researchers indicated (CH 3) 2 CH=C=O) n where n > 1 for the dehydrohalogenation of isobutyryl chloride with triethylamine.
IOData is a free and open-source Python library for parsing, storing, and converting various file formats commonly used by quantum chemistry, molecular dynamics, and plane-wave density-functional-theory software programs. It also supports a flexible framework for generating input files for various software packages.