Dictionary, Defintion, Meaning, What is Degree of Freedom, Demulsification, Decanoic Acid, Decay Rate, Deci, Decompositon, Decrepitation, Decomposition Point

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Dictionary of Chemistry Dictionary of Chemistry - Part 1 Part 2 Cathodic Protection - Cerium Charles's Law - Chemical Equivalent Chitinase - Chlorinated Rubbers Chlorine Water - Chromatography Chrome Platting - Chromium Oxides Chromyl Compounds - Claisen Condensation Clausius Mosotti Law - Coagulation Coal,Bituminous - Coherant Precipitate Common Ion Effect - Conductivity Congeners - Continuous Spectrum Copper Chlorides - Copper Hydroxides Corundum - Covalent Radius Crum Brown's Rule - Crystal System Cyanide Process or Gold - Cyclohexanol Dalton's Atomic Theory - De Broglie Equation Degree of Freedom - Demulsification Depression of Freezing Point - Destructive Distillation Deuterium (Heavy Hydrogen) - Diamagnetism Diaphragm Valve - Diazotization Dichroism - Diffraction Pattern

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Your Ad Here	Decanoic acid. (capric acid) A white crystalline straight-chain saturated carboxylic acid, CH₃ (CH₂)₆ CGOH; m.p. 315°C. Its esters are used in perfumes and flavourings. Decay rate. The rate of disintegration the rate of radioactive decay. Deci. Symbol d. A prefix used in the metric system to denote one tenth. For example, 0.1 coulomb = 1 decicoulomb (dC) Decomposition. Chennai reaction in which a compound breaks down into simple compounds or into elements. Decrepitation. A crackling noise produce when certain crystals are heated, caused by changes in structure resulting from loss of water of crystallization.
Decoctions. Pharmaceutical solutions made by boiling a drug with water and filtering. Decomposition point. In a laboratory distillation the thermometer reading coinciding with the first indications of thermal decomposition of the liquid in the flask. Degradation. A chemical reaction in which the decomposition of a molecule into simpler molecule e.g. conversion of anine in the presence of bromine and alcoholic KOH. Br₂/KOH RCoNH₂-->RnH₂
Degree of freedom. A variable factor such as temperature, pressure or concentration. The number of degrees of freedom is the smallest number that has to be fixed in order that a system can remain permanently in one position of equilibrium. Dehydration. 1. Removal of water from a substance. 2. A chemical reaction in which a compound loses hydrogen and oxygen in the ratio 2:1 For instance, ethanol passed over hot pumice undergoes dehydration to ethane : C₂H₅OH—H₂O-->CH₂:CH₂ Substances such as concentrated sulphuric acid, which can remove H2O in this way, are known as dehydrating agents.	Your Ad Here
For example, with sulphuric acid, methanoic acid gives carbon monoxide : HCOOH-->H₂O-->CO Deliquescence. The absorption of water from the atmosphere by a hygroscopic solid to such an extent that a concentrated solution of the solid eventually forms. Deliquescent substance. A material showing deliquescence. (Absorbs water from the atmosphere to form a solution) Delivery tube. A glass tube joining different pieces of apparatus, it conducts fluid from one piece of apparatus to another.
Your Ad Here	Delocalization. A description of the normal situation for molecules or ions in which a bonding electron cannot be associated only with one atom but must be considered delocalized over the whole group. Applied particularly to aromatic molecules where in, e.g. benzene, the six p electrons are delocalized over the six carbon atoms. The extra stability of the molecule over a situation with three localized double bonds is called the delocalization energy. Delta bonding. Lateral overlap between two orbitals such that there are four regions of overlap. Delta-iron. An allotropic from of pure iron that exists between 1200°C and the melting points.

Demulsification.
Emulsions of oil and water formed in various operations may require special techniques to separate the two liquid phases. This process odd emulsification can be effected by either physical or chemical means. The chemical methods depend on the opposing action of different emulsifiers on one another. Some emulsions can be broken y mechanical treatment while others can be broken electrically by a high voltage current. Some emulsions coagulate in the presence of electrolytes.

Denaturants. Substances added to dutiable articles to render them unfit for human consumption, e.g. denatured alcohol. See methylated spirits.

Denaturation. The irreversible change in solubility and other properties of proteins that occurs when a protein in solution is heated, shaken or treated with acid. Good examples are the precipitation of milk with vinegar (ethanoic acid) and the scrambling and heating of eggs. See proteins.

Dentrite. A tree-like crystal formation formed because crystal growth proceeds at different rates in certain directions from the initial crystallization point. Found particularly in alloys, and ice crystals. Many salts can be induced to crystallized and dendrites.

Dendritic salt. NaCl crystallized as dentrites. It is less dense than normal rock salt, does not cake so easily, dissolves more quickly.

Densitometer. An apparatus for measuring the intensities of e.g. lives on a photographic plate. Used in X-ray analysis and spectrometric analysis.

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Dictionary of Chemistry - Part 3 Part 4 Dilatometer - Dipole Moment Dispersing Agent - Doping Dulong Petit's Law - Dysprosium Ebonite - Einstein Equation Electrolysis - Electron Diffraction Electrophoresis - Emulsifying Agent Endothermic Reaction - Entropy Epimerism - Equilibrium Ergosterol - Esterification Ethene (ethylene) - Ethylation Eudiometer - Explosion Flavin Adenine Dinucleotide - Fehling's Solution Fenton's Reagent - Fibre Reactive Dyestuffs Fireclay - Flame Emission Spectroscopy Fluorescein - Fluorocarbons Fractional Crystallisation - Freeze Drying Fullers Earth - Fusible Alloys Gabriel's Reaction - Gas Calorimeter Gay Lussac's Law - Germanates Glass Electrode - Glyoxal

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