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  1. Naphthalene balls disappear without leaving behind any residue. Explain the phenomenon.

Naphthalene balls have the tendency to sublime i.e. it changes directly to the gaseous state therefore​ the size of the naphthalene balls slowly decreases and ultimately they disappear and no solid residue is left behind .

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Sarah UV ...that is why Because......By absorbing heat energy from the surroundings , napthalene balls s
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Napthalene (C10H8) is sublime in nature. The napthalene balls have a tendency to absorb heat from the surroundings without changing into liquid state , they transform into gaseoes state because normal temperature and pressure does allow them to exist in the liquid state. So napthalene balls change into gas eventually and reduces in size and finally it disappears without leaving any residue because entire constituent of napthalene undergoes sublimation
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Sarah,nepthaline balls dissappear without leaving any residue because it is an sublimate substance and converts directly from solid to gas.
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