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In plumbing, a trap is a U-shaped portion of pipe designed to trap liquid or gas to prevent unwanted flow; most notably sewer gases from entering buildings while allowing waste materials to pass through. In oil refineries, traps are used to prevent hydrocarbons and other dangerous gases and chemical fumes from escaping through drains.
[2] [3] As such, they serve the same purpose as the well-known S-phrases, which they are intended to replace. Precautionary statements are one of the key elements for the labelling of containers under the GHS, along with: [4] an identification of the product; one or more hazard pictograms (where necessary)
Chemist Linus Pauling first developed the hybridisation theory in 1931 to explain the structure of simple molecules such as methane (CH 4) using atomic orbitals. [2] Pauling pointed out that a carbon atom forms four bonds by using one s and three p orbitals, so that "it might be inferred" that a carbon atom would form three bonds at right angles (using p orbitals) and a fourth weaker bond ...
The TRAP gene has been cloned and sequenced in porcine, rat, human, and murine species. [11] Human, murine, and porcine TRAP genes all contain 5 exons, and have the ATG codon at the beginning of exon 2, with exon 1 being non-coding. Within the exon 1 promoter, there are three distinct “tissue-specific” promoters: 1A, 1B, and 1C. [12]
Tetrapropylammonium perruthenate (TPAP or TPAPR) is the chemical compound described by the formula N(C 3 H 7) 4 RuO 4. Sometimes known as the Ley–Griffith reagent, this ruthenium compound is used as a reagent in organic synthesis. This salt consists of the tetrapropylammonium cation and the perruthenate anion, RuO − 4.
Trap emission is a multistep process wherein a carrier falls into defect-related wave states in the middle of the bandgap. A trap is a defect capable of holding a carrier. The trap emission process recombines electrons with holes and emits photons to conserve energy. Due to the multistep nature of trap emission, a phonon is also often emitted.
The key concepts of physical chemistry are the ways in which pure physics is applied to chemical problems. One of the key concepts in classical chemistry is that all chemical compounds can be described as groups of atoms bonded together and chemical reactions can be described as the making and breaking of those bonds. Predicting the properties ...
Chemical decomposition, or chemical breakdown, is the process or effect of simplifying a single chemical entity (normal molecule, reaction intermediate, etc.) into two or more fragments. [1] Chemical decomposition is usually regarded and defined as the exact opposite of chemical synthesis. In short, the chemical reaction in which two or more ...