PCAT Chemical Processes – Solid to Gas

by Sam
Dec 18, 2017
PCAT Question of the Day

The following is a phase diagram showing the transition from solid to gas as heat is added to a substance:

Which of the following correctly indicates the relationship between the regions of the graph and the corresponding phases:

A) 1: solid, 2: phase change from solid to liquid, 5: gas

B) 2: solid, 3: phase change from solid to liquid, 4: liquid

C) 1: phase change from solid to liquid, 4: gas

D) 1: solid, 2: phase change from liquid to gas, 3: liquid

Click for Explanation

The diagram shows the relationship between heat added to a substance and its temperature. It shows that during phase changes there is no change in the temperature. The regions noted are:

1: solid

2: phase change from solid to liquid (melting / fusion)

3: liquid

4: phase change from liquid to gas (boiling / vaporization)

5: gas

Only choice (A) correctly indicates these regions.

Submit a Comment

Search the Blog

Free Consultation

Interested in our Online MCAT Course or one of our One-on-One MCAT Tutoring packages? Set up a free consultation with one of our experienced Academic Managers!

Schedule Now

Free MCAT Practice Account

Need great MCAT practice?

Get the most representative MCAT practice possible when you sign up for our free MCAT Account, which includes a half-length diagnostic exam and one of our full-length MCAT practice exams.

Learn More