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The PC-7000 uses an Intel 8086 processor, by default running at clock speed of 7.37 MHz, switchable to the IBM PC standard 4.77 MHz. [2] A stock PC-7000 comes with 384 KB of RAM, only 320 KB of which is available to the user. Sharp offered through mail order a memory expansion card which increases the RAM to 704 KB with 640 KB available to the ...
The sharp series limit is the same as the diffuse series limit. In the late 1800s these two were termed supplementary series. In 1896 Arthur Schuster stated his law: "If we subtract the frequency of the fundamental vibration from the convergence frequency of the principal series, we obtain the convergence frequency of the supplementary series". [5]
The test had 85 multiple choice questions, each consisting of five answer choices, that were to be answered in one hour. Students received 1 point for every correct answer, lost ¼ of a point for each incorrect answer, and received 0 points for questions left blank. This score was then converted to a scaled score of 200-800.
An ester of a carboxylic acid.R stands for any group (typically hydrogen or organyl) and R ′ stands for any organyl group.. In chemistry, an ester is a compound derived from an acid (organic or inorganic) in which the hydrogen atom (H) of at least one acidic hydroxyl group (−OH) of that acid is replaced by an organyl group (R ′). [1]
The word "litmus" comes from an Old Norse word for “moss used for dyeing”. [1] About 1300, the Spanish physician Arnaldus de Villa Nova began using litmus to study acids and bases. [2] [3] From the 16th century onwards, the blue dye was extracted from some lichens, especially in the Netherlands.
For example, 3-methyl-1-pentene with a rectus assignment is formatted as (R)-3-methyl-1-pentene. [12] An example of a (s) descriptor: (1R,2s,3S)-1,2,3-trichlorocyclopentane. A practical method of determining whether an enantiomer is R or S is by using the right-hand rule: one wraps the molecule with the fingers in the direction 1 → 2 → 3.
Chinese Chemistry Olympiad (Chinese: 中国化学奥林匹克竞赛) is an annual academic competition held by Chinese Chemical Society. [1] CAS changed its official Chinese name in February 2014, though its English translation remains the same. [2] [3] The first CChO was held in 1984, 16 years after IChO. The event has been held every year ...
A non-SI, metric unit of length equal to 10 −10 metre, i.e. 1 ⁄ 10000000000 of a metre or 0.1 nanometre. The angstrom is commonly used in the natural sciences to express microscopic or atomic-scale distances, including the sizes of atomic nuclei, wavelengths of electromagnetic radiation, and lengths of chemical bonds (e.g. the covalent ...