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The Caribbean Examinations Council (CXC) is an examination board in the Caribbean. [1] [2] It was established in 1972 [3] under agreement by the participating governments in the Caribbean Community to conduct such examinations as it may think appropriate and award certificates and diplomas on the results of any such examinations so conducted.
The marking scheme is same as earlier i.e. for SCQs, +4 marks for correct answer and -1 marks for incorrect answer and 0 marks for not answered, and for numerical type questions, +4 marks for correct and -1 marks for incorrect. [5] JEE-Main, unlike JEE-Advanced, has a fixed exam structure and is not subject to change every year.
Each correct response fetches 4 marks and each incorrect response gets -1 negative marking. The exam duration is 3 hours (180 min). The exam is of 720 marks (maximum marks). Since 2021, there has been a significant alteration in the format of the question paper. The latest structure includes two sections, i.e.
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.
From 2015 a large-scale programme of reform began in England, changing the marking criteria and syllabi for most subjects as well as the format of qualifications and the grading system. [10] [11] Under the new scheme all GCSE subjects were revised between 2015 and 2018 and all new awards were to be on the new scheme by summer 2020.
ACS settings should be used for both structures and reaction schemes. These settings are normally available as templates in chemical drawing programs. Use sans-serif fonts like Arial. Indexes used for labelling must be superscripted: R 1-CH 2-R 2 (not R 1-CH 2-R 2) Do not include English text in images: this prevents their reuse in other languages.
Printing quality is highly influenced by the various treatments and methods used in creating paper and enhancing the paper surface. Consumers are most concerned with the paper-ink interactions which vary for certain types of paper due to different chemical properties of the surface. [8] Inkjet paper is the most commercially used type of paper.
In organic chemistry, an alkane, or paraffin (a historical trivial name that also has other meanings), is an acyclic saturated hydrocarbon. In other words, an alkane consists of hydrogen and carbon atoms arranged in a tree structure in which all the carbon–carbon bonds are single. [1] Alkanes have the general chemical formula C n H 2n+2.