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The alkanes can exist as gases, liquids, or solids at room temperature. The unbranched alkanes methane, ethane, propane, and butane are gases; pentane through hexadecane are liquids; the homologues larger than hexadecane are solids. Branched alkanes normally exhibit lower boiling points than ...


Table 40.1. Physical Properties of the first 20 n-Alkanes. 3. VOLATILITY. Due to their low boiling points, lower alkanes are highly volatile. Volatility refers to the ability of a liquid to change into vapour state. Among alkanes volatility decreases with increase in chain length. Among isomeric alkanes more the branching, greater is the ...


Boiling Points. The boiling points shown are for the "straight chain" isomers of which there is more than one. The first four alkanes are gases at room temperature, and solids do not begin to appear until about \(C_{17}H_{36}\), but this is imprecise because different isomers typically have different melting and boiling points. By the time you get 17 carbons into an alkane, there are ...


Physical Properties of Alkanes Alkanes are Nonpolar Only dispersion forces act between molecules. Most alkanes are insoluble in water. Boiling points, melting points, and densities generally increase with the size of the alkane: Decane > Heptane > Butane


This carbon-carbon double bond changes the physicals properties of alkenes. At room temperatue, alkenes exist in all three phases, solid, liquids, and gases. Melting and boiling points of alkenes are similar to that of alkanes, however, isomers of cis alkenes have lower melting points than that of trans isomers.


Physical properties. Structure. Alkanes have the structure of C n H 2n+2. All the carbons are sp 3 hybridized, having 4 single bonds to either carbon or hydrogen. Using standard conditions (25 o C, 1atm), alkanes up to 4 carbons (i.e. butane) are gases, C 5 H 12 to C 17 H 36 are liquids, and higher than C 18 H 38 are solids.


Physical Properties of Alkanes. Alkanes exist in all three forms: as gases, liquids and solids. Methane, Ethane, propane, and butane are gases in room temperature. The unbranched structures of pentane, hexane, and heptane are liquids. Alkanes with higher molecular weight are solids.


In organic chemistry, an alkane, or paraffin (a historical name that also has other meanings), is an acyclic saturated hydrocarbon. In other words, an alkane consists of hydrogen and carbon atoms arranged in a tree structure in which all the carbon–carbon bonds are single. Alkanes have the general chemical formula C n H 2n+2.


Physical Properties of Alkynes. The properties of alkynes pretty much follow the same pattern of those of alkanes and alkenes. Alkynes are unsaturated carbon that shares a triple bond at the carbon site; All alkynes are odourless and colourless with the exception of ethylene which has a slight distinctive odour.


The physical properties of alkenes are very similar to those of alkanes. Alkenes also exist as gases, liquids, and solids at room temperature. Isomeric alkenes tend to have similar boiling points, which makes it difficult to separate them by boiling point differences.