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Ch 54: Phase Equilibria

About This Chapter

Refresh your knowledge of phase equilibria, one of the subjects you'll need to know for the physical sciences part of the Medical College Admission Test (MCAT). Watch video lessons and use quizzes to assess your progress as you review for MCAT.

MCAT: Phase Equilibria - Chapter Summary

'Phase equilibria' refers to the equilibrium relationships between the phases (liquid, gas, solid) of a compound or mixture at varying composition, pressure and temperature conditions. Watching the video lessons in this chapter will help you refresh your existing physical sciences knowledge and add to it. Below are some of the topics you'll go over:

  • Colligative properties and Raoult's Law
  • Colloids
  • Crystal structures and the unit cell
  • Henry's Law
  • Phase changes and heating curves
  • Phase diagrams: critical point, triple point and phase equilibrium boundaries
  • The kinetic molecular theory: properties of solids and liquids
  • Using colligative properties to determine molar mass

Using everyday language and examples you can relate to, these lessons help make physical sciences topics interesting and easy to remember.

MCAT: Objectives

The MCAT assesses your aptitude for medical school. You'll need to know general chemistry, organic chemistry, biology and physics concepts for the exam. Physical sciences questions constitute one-fourth of the test. The three other sections are verbal reasoning, biological sciences and the trial section.

The physical science section includes 52 multiple-choice questions. Thirty-nine questions cover seven passages found in the exam; each passage has 4-7 questions with it. The other 13 questions are independent of one another. The physical sciences section tests your knowledge of scientific concepts and your problem-solving abilities.

The video lessons on phase equilibria come with self-assessment quizzes, so you can track how well you're learning the material as you complete each lesson. With these quizzes, you'll get practice with the types of questions you'll encounter on the actual MCAT.

6 Lessons in Chapter 54: Phase Equilibria
Test your knowledge with a 30-question chapter practice test
Phase Changes and Heating Curves

1. Phase Changes and Heating Curves

Learn the phases - gas, liquid, solid and plasma. Learn what a phase diagram is and what terms describe the movement between phases: melting, sublimating, freezing, vaporization, condensation, and deposition. Discover why heating curves have plateaus, what a phase transition is, and what happens during this transition.

Phase Diagrams: Critical Point, Triple Point and Phase Equilibrium Boundaries

2. Phase Diagrams: Critical Point, Triple Point and Phase Equilibrium Boundaries

Learn what a phase diagram is and how to interpret phase diagrams. Discover how to use a phase diagram to locate the phase equilibrium boundaries. Also, learn what a triple point and critical point are and how to locate them on a phase diagram.

The Kinetic Molecular Theory: Properties of Solids and Liquids

3. The Kinetic Molecular Theory: Properties of Solids and Liquids

This lesson explores the kinetic molecular theory and how it pertains to the properties of solids and liquids. You'll learn the properties of solids and liquids, discover the types of intermolecular attractions that occur between them and gain an understanding how phase changes happen.

Crystal Structures and the Unit Cell

4. Crystal Structures and the Unit Cell

This crystallography lesson explores the structure and properties of crystals. You'll learn about the parts of a crystal structure, types of crystals and patterns created by unit cells.

Using Colligative Properties to Determine Molar Mass

5. Using Colligative Properties to Determine Molar Mass

In this lesson, we will explore the effect of colligative properties on a solution. We will learn how to calculate freezing point depression and see how it can be used to calculate the molar mass of an unknown substance.

Colligative Properties and Raoult's Law

6. Colligative Properties and Raoult's Law

Learn how vapor pressure and osmotic pressure are colligative properties. Learn Raoult's Law and how to use it to determine the vapor pressure of a solution. Learn the equation for determining osmotic pressure and how to use it to determine the molar mass of a substance.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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Other Chapters

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