The cooling curve below represents the cooling of a sample of gas. According to the cooling curve, what phase(s) would you expect to observe when the substance is at a temperature of 375 Kelvin?

Question

anonymous · Answer

attachment

anonymous · Answer

a. gas

 b. liquid

c. solid and liquid

d. liquid and gas

aaronq · Answer

can you label the cooling curve?

noelgreco · Answer

The sample started out as a gas.  The plateau at 375K represents pa phase change.

anonymous · Answer

NoelGreco is right.
two flat surfaces correspond to two phase changes.
this means the substance should be a gas which turns into a liquid and then in a solid.

at 375k, the substance in gaseous form turns into liquid. we may say that both gas and liquid are present there till the point where all gas turned in a solid and again the slope appeared.