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This article needs attention from an expert in chemistry. ... "First 25 of 125 big questions that face scientific inquiry over the next quarter-century".
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.
Unlike the Scholastic Aptitude Test (SAT) that the College Board offers, which are intended to measure general aptitude for academic studies, the Achievement Tests are intended to measure the level of knowledge and understanding in a variety of specific subjects. Like the SAT, the scores for an Achievement Test range from 200 (lowest) to 800 ...
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]
CLEP tests are primarily multiple-choice exams (though some include fill-in or ordering questions, and one College Composition exam has an essay section) which are scored on a scale from 20 to 80. The majority of schools grant credit for a score of 50 or higher, but passing scores are determined by the individual schools and may vary.
This is especially common for measurement of compounds in biological fluids; for instance, the healthy level of potassium in the blood of a human is defined between 3.5 and 5.0 mEq/L. A certain amount of univalent ions provides the same amount of equivalents while the same amount of divalent ions provides twice the amount of equivalents.
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In chemistry, a reagent (/ r i ˈ eɪ dʒ ən t / ree-AY-jənt) or analytical reagent is a substance or compound added to a system to cause a chemical reaction, or test if one occurs. [1] The terms reactant and reagent are often used interchangeably, but reactant specifies a substance consumed in the course of a chemical reaction. [1]
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