3.3.3 - Half-Life of a Reaction
Enroll to start learning
You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.
Practice Questions
Test your understanding with targeted questions
Define half-life in your own words.
💡 Hint: Think about it as time related to decay.
What is the half-life formula for a first-order reaction?
💡 Hint: Recall the specific variable associated with first-order kinetics.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What is the half-life of a first-order reaction?
💡 Hint: Think about how a reaction behaves as it progresses.
True or False: For zero-order reactions, half-life decreases as reactant concentration decreases.
💡 Hint: Consider the implications of the zero-order definition.
Get performance evaluation
Challenge Problems
Push your limits with advanced challenges
A first-order reaction has a rate constant of 0.5 h-1. How much of the reactant is left after 4 hours if you start with 1 mole?
💡 Hint: Use the half-life formula and calculate the fraction remaining after each half-life period.
For a zero-order reaction where k = 0.1 M/s and the initial concentration is 1 M, calculate the concentration after 20 seconds.
💡 Hint: Consider how zero-order dependencies work over time.
Get performance evaluation
Reference links
Supplementary resources to enhance your learning experience.