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Most IGCSE subjects offer a choice of tiered examinations: Core or Extended papers (in Cambridge International), and Foundation or Higher papers (in Edexcel). This is designed to make IGCSE suitable for students with varying levels of ability. In some subjects, IGCSE can be taken with or without coursework.
The Maths stream includes four main subjects: Combined Mathematics, Physics, Chemistry, and Information and Communication Technology (ICT). Under the recent syllabus, candidates can choose between Chemistry and ICT, although Combined Mathematics and Physics are mandatory.
GCSE results are published by the examination board in August for the exam series in April to June of the same year. They are usually released one week after the A-Level results, on the Thursday that falls between 20 August and 26 August. The examination results are released to centres (schools) prior to the release to candidates and the public.
Each grade is separated by 10%. A maximum of 6 subjects are counted, with a possible 100 points in each subject. For students sitting the higher level maths paper, an extra 25 points can be obtained by getting a grade above a H6. In practice, most students take 7 or 8 subjects and their best 6 results are counted.
Enantiomers may not be isolable if there is an accessible pathway for racemization (interconversion between enantiomorphs to yield a racemic mixture) at a given temperature and timescale. For example, amines with three distinct substituents are chiral, but with few exceptions (e.g. substituted N -chloroaziridines), they rapidly undergo ...
Chelation (/ k iː ˈ l eɪ ʃ ən /) is a type of bonding of ions and their molecules to metal ions. It involves the formation or presence of two or more separate coordinate bonds between a polydentate (multiple bonded) ligand and a single central metal atom.
Political tensions arose from issues of taxation, public spending, regulation of business, and market supervision, as well as the limits of corporate autonomy. [117] Cologne's central location on the Rhine river placed it at the intersection of the major trade routes between east and west and was the basis of Cologne's growth. [118]
This section may lend undue weight to anti-University. The specific problem is: Section reads like a news bulletin, there is too much in this section on isolated incidents and needs reducing Please help improve it by rewriting it in a balanced fashion that contextualizes different points of view.