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Quizlet was founded in October 2005 by Andrew Sutherland, who at the time was a 15-year old student, [2] and released to the public in January 2007. [3] Quizlet's primary products include digital flash cards, matching games, practice electronic assessments, and live quizzes. In 2017, 1 in 2 high school students used Quizlet. [4]
In chemistry, a chemical test is qualitative or semi-quantitative procedure designed to prove the existence of a chemical compound or chemical group with the aid of a specific reagent. Subcategories This category has the following 3 subcategories, out of 3 total.
Parts-per-million cube of relative abundance by mass of elements in an average adult human body down to 1 ppm. About 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus.
Until 1994, the SAT Subject Tests were known as Achievement Tests; until January 2005, they were known as SAT 2s; they are still well known by the latter name. On January 19 2021, the College Board discontinued all SAT Subject tests, including the SAT Subject Test in Chemistry. This was effective immediately in the United States, and the tests ...
The esterification reaction tests for the presence of alcohol and/or carboxylic acids; The Griess test tests for organic nitrite compounds; The 2,4-dinitrophenylhydrazine tests for carbonyl compounds; The iodoform reaction tests for the presence of methyl ketones, or compounds which can be oxidized to methyl ketones; The Schiff test detects ...
Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...
There are several dozens of other uranium minerals such as carnotite (KUO 2 VO 4 ·3H 2 O) and autunite (Ca(UO 2) 2 (PO 4) 2 ·nH 2 O). The isotopic composition of natural uranium is 238 U (relative abundance 99.2742%), 235 U (0.7204%) and 234 U (0.0054%); of these 238 U has the largest half-life of 4.51 × 10 9 years.
In organic chemistry, a functional group is a substituent or moiety in a molecule that causes the molecule's characteristic chemical reactions.The same functional group will undergo the same or similar chemical reactions regardless of the rest of the molecule's composition.