About This Chapter
MCAT: Kinetics and Equilibrium - Chapter Summary
These quick and comprehensive video lessons can help you prepare for the physical sciences portion of the MCAT; watching the engaging videos in this chapter will help you refresh and add to your kinetics and equilibrium knowledge. Below are some of the topics you'll go over:
- Activation energy and catalysts
- Arrhenius equation
- Chemical and dynamic equilibrium
- Equilibrium constant (K) and equilibrium quotient (Q)
- Kinetic control vs. thermodynamic control of a reaction
- LeChatelier's Principle: disruption and re-establishment of equilibrium
- Rate constant and rate laws
- Rate of a chemical reaction: modifying factors and the effect of temperature
- Reaction mechanisms and the rate determining step
- Reversible chemical reactions
- Using a RICE table in equilibrium calculations
These video lessons use simple, everyday language and examples to help make physical sciences subjects something you can relate to and remember more easily.
The MCAT determines your readiness and aptitude for medical school. General chemistry, organic chemistry, biology and physics concepts are all part of the exam. Physical sciences questions make up a quarter of the MCAT. The other three sections consist of verbal reasoning, biological sciences and the trial section.
The physical science section consists of 52 questions. Of these, 39 are based on seven passages you'll read as part of the exam. Each text passage has 4-7 questions associated with it. The remaining 13 questions are independent. This section tests your problem-solving abilities as well as your knowledge of scientific concepts.
Each of the questions on the MCAT is multiple choice. The video lessons in the kinetics and equilibrium chapter each come with a quiz so you can assess how well you've learned the material as you go. You'll also gain experience with the same types of questions you'll see on the actual test.
1. Equilibrium: Chemical and Dynamic
Learn the definition of chemical equilibrium and how it is dynamic. Discover what the equilibrium constant is and how it shows whether the reaction favors the reactants or products. Learn how chemists designate equilibrium in an equation and how they show the difference in reaction rate.
2. LeChatelier's Principle: Disruption and Re-Establishment of Equilibrium
Learn how Le Chatelier's Principle describes the disruption and re-establishment of equilibrium. Learn to explain the factors that disrupt equilibrium, such as concentration, temperature, and pressure. Learn how each of these factors affects a system in equilibrium.
3. Equilibrium Constant (K) and Reaction Quotient (Q)
In this lesson, we will first define and explain the notion of a chemical equilibrium. Then, you'll learn about the equilibrium constant and reaction quotient. Finally, we'll round off the lesson with a couple of examples to solidify what you've learned!
4. Using a RICE Table in Equilibrium Calculations
Learn what the RICE table is and how to fill in the table with the reaction, initial concentration, change in concentration and amount of product and reactants at equilibrium. Learn how to use the RICE table to calculate the concentrations and amounts and the equilibrium constant of equations at equilibrium.
5. Rate of a Chemical Reaction: Modifying Factors
Why are some reactions much faster than others? Is it possible to change how fast a reaction occurs? In this lesson, you will learn what the rate of a chemical reaction is. You will also discover how factors such as temperature, concentration, surface area, and catalysts impact reaction rates.
6. Rate Constant and Rate Laws
Learn what the rate law is and how the rate constant relates to it. Learn what reaction order is and how to determine reaction order when given experimental data containing concentration and reaction rate.
7. Rate of a Chemical Reaction: Effect of Temperature
Learn how temperature affects reaction rates. Discover the rate law as well as how the Arrhenius equation relates to the rate law and predicts the effect of temperature on the rate of reaction.
8. Activation Energy and Catalysts
Learn how to define activation energy and how it relates to a reaction's energy. Learn what an activated complex is and where it fits into an activation energy diagram. Discover how a catalyst works to change the activation energy of a reaction and what this means to metabolism in the body.
9. Reaction Mechanisms and The Rate Determining Step
This lesson explores what a reaction mechanism is and how it relates to the speed of a reaction. You'll discover how to pinpoint the rate-determining step and learn how to write a rate law based on the rate-determining step.
10. Biochemical Reactions: Synthesis and Decomposition
Did you know that there are thousands of chemical reactions going on in your body every day? In this lesson, you will learn about three types of biochemical reactions: synthesis reactions, decomposition reactions and reversible reactions.
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