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The textbook explanation for the existence of the energy maximum for an eclipsed conformation in ethane is steric hindrance, but, with a C-C bond length of 154 pm and a Van der Waals radius for hydrogen of 120 pm, the hydrogen atoms in ethane are never in each other's way. The question of whether steric hindrance is responsible for the eclipsed ...
Triple Award Science, commonly referred to as Triple Science, results in three separate GCSEs in Biology, Chemistry and Physics and provide the broadest coverage of the main three science subjects. The qualifications are offered by the five main awarding bodies in England; AQA , Edexcel , OCR , CIE and Eduqas .
A grade 8 is also equivalent to an A*, however the grade 9 is the top end of the A*. The former C grade is set at grade 4 (known as a 'standard pass') and grade 5 (considered a 'strong pass') under the numerical scheme. Although fewer qualifications have tiered examinations than before, the tiering system still exists.
Conformance testing — an element of conformity assessment, and also known as compliance testing, or type testing — is testing or other activities that determine whether a process, product, or service complies with the requirements of a specification, technical standard, contract, or regulation.
The Crutchfield Situation was an experimental procedure and apparatus created by Richard S. Crutchfield in 1955 to study conformity. Essentially, the Crutchfield Situation was an attempt to improve upon the methodology employed in the Asch conformity experiments. One of the major criticisms concerning the Asch studies was the need for many ...
When converting qualifications to school attainment points, Entry 1 is worth 10 points, Entry 2 is worth 12 and Entry 3 is worth 14. This compares to 16 points for GCSE Grade G (the lowest GCSE pass) and 22 points for GCSE Grade F. [3]
The following outline acts as an overview of and topical guide to chemistry: . Chemistry is the science of atomic matter (matter that is composed of chemical elements), especially its chemical reactions, but also including its properties, structure, composition, behavior, and changes as they relate to the chemical reactions.
Recrystallization: In analytical and synthetic chemistry work, purchased reagents of doubtful purity may be recrystallised, e.g. dissolved in a very pure solvent, and then crystallized, and the crystals recovered, in order to improve and/or verify their purity.