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