The melting & boiling point in deg. C of elements A, B, C, D & E are   -189 & -186, -219 & -183, -7 & 58, 29 & 222, .... 660 & 2450 respectively. At room temperature (30 deg. C), which element(s) is/are solid(s), liquid(s), or gas(s) & what would happen to the particles of element C when it is cooled from 80 deg. C to -10 deg. C?

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A, B, & C would be gases at room temperature because they boil (turn from a liquid to a gas) at temperatures below 30 C. D is a liquid at room temperature but it is just below its boiling point so a significant amount of it would probably be evaporating...

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A, B, & C would be gases at room temperature because they boil (turn from a liquid to a gas) at temperatures below 30 C. D is a liquid at room temperature but it is just below its boiling point so a significant amount of it would probably be evaporating into the gas phase. Element E is a solid, probably a metal, due to its high melting point.

For element C, at 80 C it is completely in the gas phase. As it cools to 29 C it undergoes a phase change from the gas to the liquid (condensation).  Once all the gas has condensed it continues cooling and at -7 C undergoes another phase change from a liquid to a solid (freezing).  Once it is all solid the solid will then cool a further 3 degrees to a final temperature of -10 C.

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