# Hydrocarbons and Phase Changes Question Help

#### betterfuture

2+ Year Member

Can anybody help me interpret this graph? I could not follow through because I interpreted the graph very differently. Thanks!

#### GiantPanda1

2+ Year Member
Anything between boiling and melting is liquid.

#### salemstein

10+ Year Member
Stuff is a liquid when its sandwiched between MP line and BP line (it melted, but hasnt boiled). 4C,5C,and 6C chains seem to fall in this range.

#### betterfuture

2+ Year Member
So when between 0 and -100 degrees Celsius, I drew a horizontal line. The points of intersection were at n=3 for the boiling point line and just nearly n=7 for the melting point line. So the question is what do the intersected points represent? A phase change that is going on? And what do the dips and different curves mean?

#### aldol16

5+ Year Member
Draw a horizontal line at -50. That line will be divided into three sections. The first section is gas. The second is liquid. The final is solid.

#### betterfuture

2+ Year Member
Are you saying the left side is gas, the middle is liquid, and the right half is solid?

#### aldol16

5+ Year Member
Are you saying the left side is gas, the middle is liquid, and the right half is solid?

Yes, along the horizontal line at -50. It's a simple phase diagram.

2+ Year Member
I see. Thanks!