Why do thicker lubricating oils have higher melting points?

A.They have longer chains of carbons.

B. Higher density always means higher melting point.

C. Unsaturated hydrocarbons have a higher density than saturated hydrocarbons.

D. Thicker oils are more solid than liquid, so they have another phase change to complete

Question

Why do thicker lubricating oils have higher melting points?



A.They have longer chains of carbons.

B. Higher density always means higher melting point.

C. Unsaturated hydrocarbons have a higher density than saturated hydrocarbons.

D. Thicker oils are more solid than liquid, so they have another phase change to complete

anonymous · Answer

you know that B is not "always" true, so why would C be relevant?

anonymous · Answer

Wait why would B not always be true? ?

photon336 · Answer

One possible explanation could be that saturated hydrocarbons don't have a any double bonds, so their structure allows them to stack and those interactions could contribute to a higher MP/BP Unsaturated because they contain double bonds don't have this interaction.

abb0t · Answer

I would argue that it's due to intermolecular attraction, if you have compounds like glycerol. But generally these are a mixture of compounds so they have more polar compounds attracting to each other, making it more viscous.