Is sublimation a chemical change or a physical change ?

In a physical change the nature of substance remains same . The properties remains same. But in case of chemical change the new kind of substance is formed, with different nature. “Sublimation is a process in which a substance changes its state from solid into vapour directly”. So the point to note here is that

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How is ethene the smallest alkene with formula C2H4? Shouldn’t methylene be the smallest alkenes with chemical formula CH2?

Actually the alkenes are the compounds that have a double bond between two carbon atoms. In the formulas given above in case of ethene we have two carbon atoms but in case of methene (just supposing actually it can’t even exist) there isn’t any second carbon atom with which it could make a double bond.

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