Correlating density and melting point in alkenes

In summary, the relationship between density and melting point in alkenes is that as the density increases, the melting point also increases. This correlation is important as it provides insight into the structure and properties of alkenes and can aid in predicting their behavior. Factors such as molecular weight, branching, and impurities can affect this relationship. There is a direct relationship between density and melting point, but it may not hold true for all alkenes. This correlation can be used in practical applications such as in polymer production, purity determination, and material design. It can also assist in identifying and characterizing unknown alkenes.
  • #1
Miffymycat
47
0
Quoted data for cis and trans 1,2 dichloroethenes shows cis has higher density but lower melting point than trans. How can this be explained? Packing arguments are clearly unable to rationalise these observations. Other 1,2 disubstituted ethenes show similar pattern. Thank you.
 
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  • #2
This homework ? What other property differs strongly ?
 
  • #3
Boiling points differ as expected - the more polar molecule (cis) is higher
 
  • #4
Yes, dipole moment is the key.
 
  • #5
Dipole moment explains boiling point but not the contrary melting point and density trend!
 

What is the relationship between density and melting point in alkenes?

The relationship between density and melting point in alkenes is that as the density increases, the melting point also increases. This is because as the density increases, the molecules are packed more tightly together, making it more difficult for them to move and vibrate, resulting in a higher melting point.

Why is it important to study the correlation between density and melting point in alkenes?

Studying the correlation between density and melting point in alkenes is important because it can provide insight into the structure and properties of these compounds. It can also help in predicting the behavior of alkenes in various processes and applications.

What factors can affect the correlation between density and melting point in alkenes?

The correlation between density and melting point in alkenes can be affected by various factors such as the molecular weight, branching, and functional groups present in the molecule. The presence of impurities can also influence this correlation.

Is there a direct relationship between density and melting point in alkenes?

Yes, there is a direct relationship between density and melting point in alkenes. As the density increases, the melting point also increases. However, this relationship may not hold true for all alkenes as other factors can also play a role.

How can the correlation between density and melting point in alkenes be used in practical applications?

The correlation between density and melting point in alkenes can be used in various practical applications such as in the production of polymers, determination of purity, and in the design of new materials with specific properties. It can also aid in the identification and characterization of unknown alkenes.

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