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A major part of this criticism is that, while a three- or four-subject curriculum can be balanced across the spectrum—for example, students may choose one science subject (e.g. Maths, Chemistry, or Biology), a language subject (e.g. English Language, English Literature, French, German, Spanish), and a "creative" subject (e.g. Art Studies ...
A student typically studies four subjects at Cambridge International AS-Level and finishes three of those subjects at Cambridge International A-Level. Each subject a student completes receives a separate grade. The different grades are allocated according to "difficulty" in exams by applying a so-called "grade threshold" scheme.
A Level module exams and courseworks are worth a set number of UMS marks. These modules and courseworks for a specific A Level combine to give a total UMS mark. For example, an A level Chemistry course might consist of 4 exams worth 90 UMS and 2 exams worth 120 UMS, totalling a maximum of 600 UMS.
Ordinary levels were usually taken at the age of 16, and Advanced levels at the age of 18 after a further two-year course. Both the O level and A level courses were examined by subject, and matriculation (the minimum standard for university entrance) was set at five passes in different subjects, of which two had to be at A level.
The A-level (Advanced Level) is a subject-based qualification conferred as part of the General Certificate of Education, as well as a school leaving qualification offered by the educational bodies in the United Kingdom and the educational authorities of British Crown dependencies to students completing secondary or pre-university education. [1]
The AS-level syllabus of a certain subject was a selected part of the AL syllabus, but the questions of an AS-level examination were as difficult as the full AL counterpart. AS-level papers shared some of the questions with the AL counterpart and in those questions, the marking schemes for both A-level and the AS-level were identical.
In organic chemistry, there can be more than one chemical compound with the same composition and molecular weight. Generally, these are called isomers. Isomers usually have substantially different chemical properties, and often may be isolated without spontaneously interconverting. A common example is glucose vs. fructose.
For example, water is always composed of a 2:1 ratio of hydrogen to oxygen atoms, and ethanol (ethyl alcohol) is always composed of carbon, hydrogen, and oxygen in a 2:6:1 ratio. However, this does not determine the kind of molecule uniquely – dimethyl ether has the same ratios as ethanol, for instance.