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Topic: Homologous series


In the News (Tue 23 Jul 19)

  
  Homologous Series - Search Results - MSN Encarta
Homologous Series, family of organic (carbon-based) compounds with the same functional group but with a different number of carbon atoms—that is, a...
The saturated open-chain hydrocarbons form a homologous series called the alkane, or paraffin, series.
In chemistry, a homologous series is a series of organic compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group, and shows a...
uk.encarta.msn.com /Homologous_Series.html   (168 words)

  
 JEE Syllabus : IIT JEE Syllabus
Arithmetic, geometric and harmonic progressions, arithmetic, geometric and harmonic means, sums of finite arithmetic and geometric progressions, infinite geometric series, sums of squares and cubes of the first n natural numbers.
Transition elements (3d series): Definition, general characteristics, oxidation states and their stabilities, colour (excluding the details of electronic transitions) and calculation of spin-only magnetic moment; Coordination compounds: nomenclature of mononuclear coordination compounds, cis-trans and ionisation isomerisms, hybridization and geometries of mononuclear coordination compounds (linear, tetrahedral, square planar and octahedral).
Preparation, properties and reactions of alkanes: Homologous series, physical properties of alkanes (melting points, boiling points and density); Combustion and halogenation of alkanes; Preparation of alkanes by Wurtz reaction and decarboxylation reactions.
www.iitjee.org /iit-jee-syllabus.html   (1806 words)

  
  Series - LoveToKnow 1911
The series i - i + I - I+..., where S n is unity or zero, according as n is odd or even, is an example of an oscillating series.
A series such that the series formed by taking all its terms positively is convergent is said to be absolutely convergent; when this is not the case the series it said to be semi-convergent or conditionally convergent.
The circle of convergence may be of infinite radius as in the case of the series for sin z, viz.
www.1911encyclopedia.org /Series   (4894 words)

  
 Antimicrobial Evaluation of N-Alkyl Betaines and N-Alkyl-N,N-Dimethylamine Oxides with Variations in Chain Length -- ...
The MICs of the betaine series decreased with
Correlation of MIC with CMC for a homologous series of N-alkyl betaines.
Correlation of MIC with CMC for a homologous series of N-alkyl-N,N-dimethylamine oxides.
aac.asm.org /cgi/content/full/44/9/2514   (2439 words)

  
 Homologous series - Wikipedia, the free encyclopedia
In chemistry, a homologous series is a series of organic compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group, and shows a gradation in physical properties as a result of increase in molecular size and mass (see relative molecular mass).
Organic compounds in the same homologous series vary by a CH Alkanes (paraffins), alkenes (olefins), Methoxyethane (ethers), and alkynes (acetylenes) form such series in which members differ in mass by 14, 12, and 10 atomic mass units, respectively.
Chain homologization in sugars occurs in the Kiliani-Fischer synthesis.
en.wikipedia.org /wiki/Homologous_series   (349 words)

  
 Hydrocarbons - Printer-friendly - MSN Encarta
All the members of the series are unreactive; that is, they do not react readily at ordinary temperatures with such reagents as acids, alkalies, or oxidizers.
The first four members of the series are gases at ordinary temperature and pressure; intermediate members are liquids; and the heavier members are semisolids or solids.
As in the paraffin series, the lower members are gases, intermediate compounds are liquids, and the higher members of the series are solids.
encarta.msn.com /text_761579268___2/Hydrocarbons.html   (418 words)

  
 Applying Pattern Recognition Methods to Analyze the Molecular Properties of a Homologous Series of Nitrogen Mustard ...
Homologs 4 to 9 fall within supercluster at node B, which is divided further to supercluster at node C having homologs 6 to 9.
Homologs having 1, 2, and 3 methylene groups fall under node A and homologs having 4 to 9 fall under node B. Similar homologs are as follows: 2 and 3, 4 and 5, 6 and 7, 8 and 9.
Homologs are paired with another member of the series with the exception of homolog 1, which is seen as distinct but falling within a supercluster with homologs 2 and 3 (see Figure 3).
www.aapspharmscitech.org /view.asp?art=pt070235   (4641 words)

  
 Sulfosalt mineralogy today
Makovicky considered homologous structures as those that have certain structural units in common, and a homologous series as a series of homologous structures that can be theoretically derived from one basic structural unit.
In fact, it is a classification of ideal homologous structures, but not sulfosalt minerals, because chemical factors are not given enough consideration and a homologous series combines often chemically different minerals with the same topology of structure.
Homologous series with related derivative structures should be recognized as a classification unit in isoelemental sulfosalt groups.
www.igem.ru /igem/mine/sulfosalts.htm   (2031 words)

  
 IMA commission on new minerals and mineral names: Procedures and guidelines on mineral nomenclature 1998, The ...
Homologous structures are those that consist of structural units built on common structural principles and which contain the same chemical elements, although in different proportions, and which differ with respect to the size of the units.
A homologous series is a series of structures that can be derived from one type of basic structural unit using one type of recombination principle.
An accretional homologous series, also known as a polysomatic series, is one in which the types of building blocks (rods, layers, etc.) and the principles that define their mutual relationships remain preserved, but in which the sizes of these blocks vary incrementally (Veblen, 1991).
www.findarticles.com /p/articles/mi_qa3672/is_199905/ai_n8839539/pg_5   (604 words)

  
 Simple Relationships for the Estimation of Melting Temperatures of Homologous Series
The melting behavior of a homologous series is described in terms of the melting of the parent molecule and of the polymer the series eventually forms.
These equations appear applicable for the quantitative evaluation of the melting behavior of any homologous series, provided care is taken to consider compounds characterized by the same symmetry number.
Series with members exhibiting liquid-crystal behavior are successfully modeled by these equations, provided the transition correlated is the temperature at which the liquid becomes isotropic.
pubs.acs.org /cgi-bin/jtext?jceaax/46/i03/abs/je0002235   (357 words)

  
 hydrocarbon - HighBeam Encyclopedia   (Site not responding. Last check: 2007-10-24)
Each member of such a series shows a definite relationship in its structural formula to the members preceding and following it, and there is generally some regularity in changes in physical properties of successive members of a series.
The alkanes are a homologous series of saturated aliphatic hydrocarbons.
The various alkyl derivatives of benzene are sometimes referred to as the benzene series.
www.encyclopedia.com /doc/1E1-hydrocar.html   (564 words)

  
 #1 Site For Learning Chemistry
In general, a homologous series is a group of organic compounds having similar structure and chemical properties.
Homologous series of alkane is methane, ethane, propane, n-butane, n-pentane.
Homologous series of alkenes is ethene, propene, butene, etc. Homologous series of alkynes is ethyne, propyne, butyne, etc. As we will study reactions of these hydrocarbons, you will see how the homologous series show similar properties, similar substitution reactions and how they can be prepared by similar methods.
home.att.net /~cat6a/org_chem-III.htm   (386 words)

  
 The Interaction of Plasma Proteins and Platelets with a Homologous Series of Polyurethanes (SPE) (MPB archive, Jan 96)
This homologous series of polyurethanes, which varied in morphology and surface structure, was prepared to evaluate the significance of composition-independent parameters on blood/materials interactions.
In this study, a homologous series of polyurethane microparticles featuring a constant ratio of hard segment to soft segment was produced to evaluate the significance of composition-independent parameters on blood/materials interactions.
The current series of experiments indicated that intermediate-sized hard-segment domains with high phase purity are less thrombogenic in blood interaction than are those polyurethanes with larger or smaller hard-segment domains or less phase purity.
www.devicelink.com /mpb/archive/96/01/004.html   (2280 words)

  
 Internal and external reconnection in a series of homologous solar flares
Internal and external reconnection in a series of homologous solar flares
An emerging flux region (EFR) impacted against a sunspot to the west and next to a coronal hole to the east is the source of the repeated flaring.
Citation: Sterling, A., and R. Moore (2001), Internal and external reconnection in a series of homologous solar flares, J.
www.agu.org /pubs/crossref/2001/2000JA004001.shtml   (408 words)

  
 [No title]
An homologous series is a series of organic chemicals whose formulae differ from each other by -CH Each member has a longer hydrocarbon chain than the previous one.
Although the chemical reactions shown by the members of an homologous series will be similar, they will often show a trend in reactivity (i.e.
The members of an homologous series will have similar physical properties to each other but again there will be trends.
members.lycos.co.uk /SMC_Chem/AS2.2ai.htm   (217 words)

  
 Hydrophobic effect   (Site not responding. Last check: 2007-10-24)
The picture below demonstrates the dependencies of retention of three different homologous series on the number of carbon atoms in their alkyl chain.
Nuclei of this homologous series are very polar and do not show any significant interaction with the surface.
This means, that if we know the retention of at least two members of homologous series then we can calculate the retention of all others.
hplc.chem.shu.edu /NEW/HPLC_Book/Rev.-Phase/rp_hydro.html   (353 words)

  
 [No title]   (Site not responding. Last check: 2007-10-24)
omologous series - a series of related molecules with the same functional group or groups but whose structures differ by a fixed group of atoms.
Each member of a homologous series is known as a homologue.
For example, the straight-chain alkanes form a homologous series with general formula C
www.sunderland.ac.uk /~hs0bcl/gg/homologous_series.htm   (62 words)

  
 What is Z-BaSICTM   (Site not responding. Last check: 2007-10-24)
Classifying organic compounds by a set of homologous series.
Correlating chemical, thermodynamic and physical properties with the number of carbons in the homologous series.
Quantitatively analyzing each component of a mixture according to its homologous series class and its number of carbons.
www.jwba.com /zsummary.htm   (66 words)

  
 Alcohols   (Site not responding. Last check: 2007-10-24)
The aliphatic alcohols are a series of homologous series organic compounds containing one or more hydroxyl groups [-OH] attached to an Alkyl Radical.
Thus, when the hydroxyl group is replaced by a chlorine atom from phosphorus pentachloride fumes of hydrogen chloride are evolved and this is used in testing for the presence of the hydroxyl group in a compound.
The lower members of the homologous series of aliphatic alcohols (containing C1 to C10) are clear colourless liquids at room temperature.
www.ucc.ie /ucc/depts/chem/dolchem/html/dict/alcohols.html   (1050 words)

  
 Homology - Wikipedia, the free encyclopedia
Homology (biology): structures are said to be homologous if they are alike because of shared ancestry.
Homology (mathematics), a procedure to associate a sequence of abelian groups or modules with a given mathematical object.
Homologous series (chemistry), a series of organic compounds with a similar general formula.
en.wikipedia.org /wiki/Homology   (153 words)

  
 UNIT 9 - ORGANIC CHEMISTRY   (Site not responding. Last check: 2007-10-24)
As the members of a series increase in molecular size the boiling points and freezing points increase due to the increase in the van der Waals forces.
The series of unsaturated hydrocarbons containing one double bond and having the general formula CnH(2n) is called the alkene series.
The series of unsaturated hydrocarbons containing one triple bond and having the general formula CnH(2n-2) is called the alkyne series.
dwb.unl.edu /Chemistry/LearningObjectives/NY09.html   (1843 words)

  
 Hydrocarbons and Haloalkanes
An homologous series is an ordered series of organic compounds, each member of which differs from the preceeding one by the insertion of a -CH2- group in the molecule.
The first ten members of the homologous series of alkanes is shown below.
The names of the alkanes in the homologous series give rise to a way of naming any alkane, and with the application of certain rules, this can be applied to naming all organic compounds.
www.physchem.co.za /Organic/Hydrocarbons.htm   (790 words)

  
 Empirical Versus Mechanistic Modelling: Comparison of an Artificial Neural Network to a Mechanistically Based Model for ...
The aim of the current study was to compare the predictive performance of a mechanistically based model and an empirical artificial neural network (ANN) model to describe the relationship between the tissue-to-unbound plasma concentration ratios (Kpu's) of 14 rat tissues and the lipophilicity (LogP) of a series of nine 5-n-alkyl-5-ethyl barbituric acids.
The purpose of this article is to compare the predictive performance of a mechanistically based model with an empirically based model, developed by us, for the relationship between the tissue distribution and the lipophilicity of a homologous series of
In order to relate structural attributes of compounds to their pharmacokinetic behavior, a research program was initiated involving the study of a homologous series of nine 5-n-alkyl-5-ethyl barbituric acids
www.aapspharmsci.org /view.asp?art=ps010417   (3915 words)

  
 Alkanes
An homologous series is a series of compounds that differ in succession by a constant increase in Carbons and Hydrogens from one member to another in the series:
Name the branched groups in alphabetical order attaching (hyphenating) the carbon number it is attached to along the continuous chain of carbons to the front of the branch name.
If more than one of the same kind of branched group is attached to the chain, identify the number carbon each group is attached to as a series of numbers separated by commas between each number then a hyphen and finally use a greek prefix attached to the branch name.
members.aol.com /logan20/alkanes.html   (1192 words)

  
 Matt's Unit 9 Outline
A homologous series of compounds is a group or related compounds in which each member differs from the one before it by the same additional unit.
The difference in numbers of atoms among the molecular formulas of consecutive members of a homologous series is called the increment.
Other series of organic compounds in which one or more hydrogen atoms of a hydrocarbon, saturated or unsaturated, is replaced by other elements.
members.aol.com /dragoonff3/munit9.htm   (1655 words)

  
 Organic Functional Groups and Homologous Series: A summary for GCE AS-A2 or US K12 subsiduary advanced level at Doc ...
Organic Functional Groups and Homologous Series: A summary for GCE AS-A2 or US K12 subsiduary advanced level at Doc Brown's Chemistry Clinic.
The term 'functional' group is linked to the concept of a homologous series.
A homologous series is a group of molecules with the same general formula and the same functional group.
www.wpbschoolhouse.btinternet.co.uk /page06/FunctionalGroups.htm   (1155 words)

  
 LiqCryst 4.5
for phase transition temperatures as well as, in homologous series, for the dependence of phase transition temperatures on structure.
The program is a newly developed object-oriented database engine, based on the SciDex technology, which allows quick searches to be made for substructures, properties, similarities, chemical elements, phase sequences, transition temperatures, physical measurements and references.
Trends or irregularities in homologous series can be visualized graphically.
www.lci-publisher.com /liqcryst.html   (623 words)

  
 AUFBAU1 [ORGANIC CHEMISTRY]
A group of compounds are said to belong to the same homologous series if they have the same functional group but different chain lengths or ring sizes.
__________________ _______________________________________________________________________ [1] (c) Ozone, when produced by a complex series of photochemical reactions involving nitrogen oxides and unburnt hydrocarbons emitted from vehicle exhausts, is a component of photochemical smog.
Aside from conserving non-renewable resources, the recycling of addition polymers, followed by catalytic cracking and fractional distillation, should be better for the environment than their disposal: certainly, present methods cause serious problems.
www.wissensdrang.com /auf1oca.htm   (6702 words)

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