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TET 323University of IbadanSep 28, 2026

PCH 201: Chemical Reaction Kinetics & Pharmaceutical Applications

Structure

11 Concept Stages

Practice Exam

103+ Questions

Active Recall

Exam-Matched

Executive Topic Summary

Master how fast drugs break down and react, from calculating reaction rates and half-lives to applying kinetic principles to drug stability, shelf-life prediction, and fate in the body.

High-Yield Exam Takeaways

  • Why Do We Care About Reaction Rates?
  • Measuring Speed: Reaction Rate & The Rate Law
  • Zero-Order Reactions: Constant Speed
  • First-Order Reactions: Exponential Decay
  • Second-Order Reactions: When Two Molecules Meet
  • How to Find the Order and Rate Constant
  • The Arrhenius Equation: Temperature's Powerful Effect
  • Collision Theory & Transition State Theory
  • How the Solvent Influences Reaction Rate
  • Other Factors: Catalysts and Light
  • Applying Kinetics to Pharmacy: Shelf-Life & Stability

Study Tree Preview (Bite-Sized Concepts)

Previewing 3 stages

1Why Do We Care About Reaction Rates?

2 Micro-Bites
The Pharmacist's Kinetic Dilemma:Think about everyone involved with a drug. The manufacturer needs it to stay potent on the shelf. The pharmacist needs to know how to store it and advise patients. The doctor and p...
What Controls How Fast a Reaction Goes?:Every chemical reaction has a speed, or rate, that depends on the conditions. The main factors that act like dials controlling this speed are: - **Concentration of the reactants** ...

2Measuring Speed: Reaction Rate & The Rate Law

3 Micro-Bites
Defining the Speed of a Chemical Change:Let's define speed precisely. For a simple reaction like $X + Y \rightarrow P$, the rate is how fast the reactants disappear or the product appears. We write it as a derivative: $$...
Order of Reaction: What Concentration Matters?:The <term def="the power to which the concentration of a reactant is raised in the rate law">order of a reaction</term> tells us how many concentration terms control the speed. It'...

3Zero-Order Reactions: Constant Speed

2 Micro-Bites
When Speed Doesn't Depend on Concentration:In a <term def="a reaction where the rate is constant and does not depend on the concentration of reactants">zero-order reaction</term>, the rate is just a constant, $k$. The speed...
Half-Life and Units for Zero Order:The <term def="the time required for the concentration of a reactant to decrease to half of its initial value">half-life ($t_{1/2}$)</term> is super useful. For zero order, we set ...

Sample Practice Questions (Active Recall)

Showing 3 of 103+

Q1.Which of the following best explains the primary pharmaceutical concern that reaction kinetics addresses?

AThe thermodynamic stability of a drug's crystalline form.
BThe color and physical appearance of a drug formulation over time.
CThe speed at which a drug undergoes chemical changes affecting its potency and safety.
DThe equilibrium constant of a drug's synthesis reaction.

Q2.For a drug to produce its therapeutic effect, it must first dissolve into a molecular solution in the body.

ATrue
BFalse

Q3.What is the consequence of increasing temperature on the rate of most drug degradation reactions?

AThe rate remains constant if the reaction is zero-order.
BThe rate decreases exponentially because molecules have too much energy.
CThe rate increases linearly with the square of the temperature.
DThe rate increases exponentially because a larger fraction of molecules possess the activation energy.

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