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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 ...
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.
In thermochemistry, a thermochemical equation is a balanced chemical equation that represents the energy changes from a system to its surroundings.One such equation involves the enthalpy change, which is denoted with In variable form, a thermochemical equation would appear similar to the following:
For standard conditions in electrochemistry (T = 25 °C, P = 1 atm and all concentrations being fixed at 1 mol/L, or 1 M) the standard reduction potential of hydrogen is fixed at zero by convention as it serves of reference.
In chemical thermodynamics, the reaction quotient (Q r or just Q) [1] is a dimensionless quantity that provides a measurement of the relative amounts of products and reactants present in a reaction mixture for a reaction with well-defined overall stoichiometry at a particular point in time.
P1 Zn 2 SiO 4:Mn: Green 530 nm 11 ns Low For electrons GS ZnS:Cu: Green 520 nm Minutes Long For X-rays NaI:Tl: For X-ray, alpha, and electrons CsI:Tl: Green 545 nm 5 μs Yes For X-ray, alpha, and electrons ND 6 LiF/ZnS:Ag: Blue 455 nm 80 μs For thermal neutrons: NDg 6 LiF/ZnS:Cu,Al,Au: Green 565 nm 35 μs For neutrons Cerium doped YAG phosphor ...
In organic chemistry, an alkane, or paraffin (a historical trivial name that also has other meanings), is an acyclic saturated hydrocarbon. In other words, an alkane consists of hydrogen and carbon atoms arranged in a tree structure in which all the carbon–carbon bonds are single. [1] Alkanes have the general chemical formula C n H 2n+2.
In photography, formaldehyde is used in low concentrations for the process C-41 (color negative film) stabilizer in the final wash step, [61] as well as in the process E-6 pre-bleach step, to make it unnecessary in the final wash. Due to improvements in dye coupler chemistry, more modern (2006 or later) E-6 and C-41 films do not need ...