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A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and chemical formulas.The reactant entities are given on the left-hand side and the product entities are on the right-hand side with a plus sign between the entities in both the reactants and the products, and an arrow that points towards the products to show the direction of the reaction. [1]
1.3 Chemistry. 1.4 Biology. 1.5 Economics. 2 Other equations. Toggle Other equations subsection. 2.1 Mathematics. ... Laws of science; Defining equation (physical ...
A mnemonic is a memory aid used to improve long-term memory and make the process of consolidation easier. Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics. This article contains the list of certain mnemonics in chemistry.
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". [3]
^a Irish-medium exams are only available in Northern Ireland, from the CCEA exam board. ^b Welsh-medium exams are only available in Wales, from the WJEC exam board. The General Certificate of Secondary Education ( GCSE ) is an academic qualification in a range of subjects taken in England , Wales , and Northern Ireland , having been introduced ...
2012: A Channel 4 News investigation revealed that examiners were making the most basic errors, such as wrongly adding up marks on hundreds of papers, which in some cases led to candidates in 2011 getting an incorrect grade. A senior supervisor at OCR, David Leitch, ordered his team perform supplementary checks on scripts by the same markers ...
Solution of these equations gives all the information needed to calculate the concentrations of all the species. [ 16 ] Thus, the importance of equilibrium constants lies in the fact that, once their values have been determined by experiment, they can be used to calculate the concentrations, known as the speciation , of mixtures that contain ...
The National Standard Examination in Chemistry or NSEC is an examination in chemistry for higher secondary school students in India, usually conducted in the end of November. [1] The examination is organized by the Indian Association of Chemistry Teachers. Over 30,000 students, mainly from Standard 12, sit for this examination.