An homologous series is a group of compounds with similar structural features that can be represented by a general formula whose members differ by one -CH 2 - unit.. You can think of an homologous series as a 'family' or group of compounds, whose chemical behaviour is very similar and whose physical properties show trends when ascending the members of the group (in terms of … Find data for each member of your homologous series. The increasing boiling point is due to the increasing intermolecular forces of attraction between molecules of increasing size. A homologous series refer to organic molecules or compounds that have a similar molecular formula, which causes the compounds to have similar chemical properties. A series of a organic compound each containing a characteristic functional group and the successive members differ by from each other in molecular formula by --CH2--(methylene) group is called homologous series. Choose a functional group (aldehyde, carboxylic acid, ketone, amine, or alcohol). 2. (This will count as a lab grade) A homologous series is a set of organic compounds with the same functional group that vary only by a CH2 group. Homologous series of carbon compounds are so called because in such a series of compounds, the same functional group dictates the properties of the carbon compound regardless of the length of the carbon chain. Variation of some physical properties in a homologous series of hydrocarbons are described below. 4) All the members of the same homologous series can be prepared by the similar general methods of preparation. The steady change in physical properties of the alkanes in the homologous series is caused by the steadily increasing molecular size. Definition. Characteristics / Properties of Homologous series :-1. As the molecular size of the compound increases within the homologous series, the physical properties also exhibit a … (i) Variations in melting and boiling points. The reason homologous series are interesting when studying chemistry is because if there is a change in a physical property, it is due to the extra methylene group. Choose a physical property to investigate. made for a btec level 3 applied science class. A homologous series is a family of organic compounds that: *have the same general formula. The physical properties of various members of a homologous series change regularly with an increase in the molecular mass. among the members of the same homologous series. Gives example of homologous series (alkanes, alkenes and alcohols)and physical properties . Graph and analyze trend. The properties of the homologous series gradually change along with the series, and these changes can often be explained by slight differences in molecular size and mass. The two consecutive members of a homologous series are CH 3 OH and C 2 H 5 OH (belong to alcohol) A fact sheet that was used for an assignment looking at the differences in physical properties of different homologous series related to … It can be represented by the same general formula. 5) There is a regular gradation in the physical properties like melting point, density etc.
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