Explain why polythene melts at a higher temperature than methane.?

Question

There are 3 main points of the answer

Answer 1

Maybe because Polythene is a plastic and normally solid at room temp and methane is a gas and therefore has already "melted"
The bonds between the polymers are different in different plastics and will degrade at different temps because of this
Dont know if you have put the wrong materials in and want an explaination of the differences between groups of plastics

Answer 2

Polythene's melting point is higher than that of methane's - this is due to the fact that polythene possesses more bonds.

For any particular chemical bond - say the covalent bond between carbon and oxygen - there is a certain amount of energy it takes to break that bond. If the bond is strong then the amount of energy needed would be higher to successfully break the bond hence causing a solid substance to melt with the use of thermal energy in this case. This value is called the bond energy or bond enthalpy.

For example: the average bond enthalpy for C – O bonds is 358 kJmol-1.

In relation to this question the elements in both of the molecular compounds are the same so each bond has the same bond enthalpy; however the amount of bonds are not equal therefore more energy is needed to successfully break the bonds as there are more of them to break.

It could be simpler if we think of it this way: it would take a lot more energy for anybody to sprint up 4 flights of stairs than it would for somebody to sprint up 1 flight of stairs.

Answer 3

No, simply by actuality approximately 1000 years in the past those comparable aspects have been warmer then they're at present so we've seen this advance in methane previously. Even the IPCC concurs that the previous warming sessions have been community and a brilliant style of the permafrost are in those community aspects. additionally, final time I checked, methane is measured on the areas consistent with billion point and we don't completely understand what previous quantities have been considering the fact that it somewhat is one in each and every of those minor gasoline. yet you keep attempting all distinctive aspects and doubtless your group will certainly locate something that hasn't handed off previously.

Answer 4

Polythene is a polymer of ethene, meaning lots of ethenes tied togther. This makes it a longer molecule, the bonds are harder to break because:
1) the intermolecular forces are stronger
2) the molecule is more compact

Answer 5

ployethene is a polymer of ethene and methane is an alkane. so therefore ethene wil have one sigma and pi bond whereas alkane has one sigma bond so alkane is more stable than alkene because the bonds are stronger in alkane. so it does not melt at higher temperatures but alkenes melt.

Answer 6

Poly(ethene) has very long chains, and so has very large attractive intermolecuar forces.
Methane has very small molecules, so has very weak attractive forces.
The larger the attractive forces, the more energy is required to separate the molecules and melt the substance.