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Fluorine

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Old question, but I just want to make sure the correct answer is given. Work when being compressed in negative and when being expanded is positive. When work is negative it is being done TO the system and when positive is being done BY the system. So the
Paraffin wax is a covalent compound, so when it melts the molecules simply pull away from each other, leaving the bonds intact, because of this Parffin wax melting is a physical change.
The reason why Methane being nonpolar and having london dispersion forces is important, is because low london dispersion forces results in a low boiling point. Boiling points are always equal to the condensation point. If Methane exhibited a different type
I know this is a late reply but who cares ¯\_(ツ)_/¯ Methane has London dispersion forces, they are weak. Because of this Methane condenses to a liquid at -161.85 celsius. Due to Uranus and Neptune being so far from the Sun, they are -224 and -214

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