Ropy example sentences

The change in entropy accompanying a chemical reaction may be estimated qualitatively by a consideration of the structures of the species taking part in the reaction.If the carbon chain is unsaturated, then the final 'ane' in the name of the carbon chain is substituted by 'ene' or 'yne' as given in Table For example, a three-carbon chain with a double bond would be called propene and if it has a triple bond, it would be called propyne.Common and IUPAC names of a few members of alkyne series are given in Table 1 You have already learnt that ethyne and propyne have got only one structure but there are two possible structures for butyne – but-1-yne and but-2-yne.Entropy, like any other thermodynamic property such as internal energy U and enthalpy H is a state function and ?S is independent of path.The above mentioned disorder is the manifestation of entropy.?rG0 also depends upon ?rS0, if the changes in the entropy of reaction is also taken into account, the value of K or extent of chemical reaction will also be affected, depending upon whether ?rS0 is positive or negative.To form a mental picture, one can think of entropy as a measure of the degree of randomness or disorder in the system.When a system is in equilibrium, the entropy is maximum, and the change in entropy, ?S = 0.Though these materials have now become common, excessive use of polythene and polypropylene is a matter of great concern for all of us.If the structure of the products is very much disordered than that of the reactants, there will be a resultant increase in entropy.Here, we have considered both terms together for spontaneity: energy (in terms of ?H) and entropy (?S, a measure of disorder) as indicated earlier.Therefore, for most of the chemical reactions there are changes in both enthalpy and entropy.We have seen that for a system, it is the total entropy change, ?Stotal which decides the spontaneity of the process.It is clear from the discussion in previous sections that neither decrease in enthalpy nor increase in entropy alone can determine the direction of spontaneous change for these systems.For a given substance, the crystalline solid state is the state of lowest entropy (most ordered), The gaseous state is state of highest entropy.