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Expressing resonance when drawing Lewis structures may be done either by drawing each of the possible resonance forms and placing double-headed arrows between them or by using dashed lines to represent the partial bonds (although the latter is a good representation of the resonance hybrid which is not, formally speaking, a Lewis structure).
It is named after Warren K. Lewis (1882–1975), [6] [7] who was the first head of the Chemical Engineering Department at MIT. Some workers in the field of combustion assume (incorrectly) that the Lewis number was named for Bernard Lewis (1899–1993), who for many years was a major figure in the field of combustion research. [citation needed]
Nitric oxide (nitrogen oxide or nitrogen monoxide [1]) is a colorless gas with the formula NO.It is one of the principal oxides of nitrogen.Nitric oxide is a free radical: it has an unpaired electron, which is sometimes denoted by a dot in its chemical formula (• N=O or • NO).
Strontium is a chemical element; it has symbol Sr and atomic number 38. An alkaline earth metal , strontium is a soft silver-white yellowish metallic element that is highly chemically reactive . The metal forms a dark oxide layer when it is exposed to air.
Aspirator - Beaker - Boiling tube - Büchner funnel - Bunsen burner - Burette - Calorimeter - Colorimeter - Conical measure - Nuclear Magnetic Resonance - Mass Spectrometer - Liquid Chromatography - Gas Chromatography - Crucible - Cuvette - Laboratory flasks (Büchner, Erlenmeyer, Florence, Retort, Round-bottom, Volumetric) - Fume hood - Gas syringe - Graduated cylinder - Perkin triangle ...
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 ...
Sulfur trioxide can be prepared in the laboratory by the two-stage pyrolysis of sodium bisulfate. Sodium pyrosulfate is an intermediate product: [17] Dehydration at 315 °C: 2 NaHSO 4 → Na 2 S 2 O 7 + H 2 O; Cracking at 460 °C: Na 2 S 2 O 7 → Na 2 SO 4 + SO 3; The latter occurs at much lower temperatures (45–60 °C) in the presence of ...
On a laboratory scale, the action of hot concentrated sulfuric acid on copper turnings produces sulfur dioxide. Cu + 2 H 2 SO 4 → CuSO 4 + SO 2 + 2 H 2 O Tin also reacts with concentrated sulfuric acid but it produces tin(II) sulfate which can later be pyrolyzed at 360 °C into tin dioxide and dry sulfur dioxide.