Melting and boiling temperatures of different substances

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SUMMARY

The discussion centers on identifying which substance is a gas at 25°C based on provided melting and boiling points. The substances listed are A (melting point -219°C, boiling point -183°C), B (melting point -7°C, boiling point 58°C), C (melting point 98°C, boiling point 890°C), and D (melting point 1083°C, boiling point 2582°C). Substance A is confirmed as a gas at 25°C since its boiling point is -183°C, which is below 25°C. The explanation emphasizes the relationship between melting and boiling points in determining the state of a substance at a given temperature.

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riyada
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Hi all
I am sorry for the double post, I just found out there is a homework help place here..
I have this question in a practice physics exam:
The table lists melting and boiling temperatures of 4 different substances, A,B,C,D..
The question is "Which substance is a gas at 25 C?"

Substance Melting point /C Boiling point/C
A -219 -183
B -7 58
C 98 890
D 1083 2582

I have no idea how to get the answer.. Can someone please explain how..
Thanks!
 
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Welcome to PF!

riyada said:
The table lists melting and boiling temperatures of 4 different substances, A,B,C,D..
The question is "Which substance is a gas at 25 C?"

Substance Melting point /C Boiling point/C
A -219 -183
B -7 58
C 98 890
D 1083 2582

Hi riyada! Welcome to PF! :smile:

A solid melts at its own melting point, and becomes a liquid.

A liquid boils at its own boiling point, and becomes a gas.

The question gives you the melting point and the boiling point of four substances. :smile:
 
Beautifully answered!
Its "A"..
Thanks a MIL!
 

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