In this video Paul Andersen explains why the slowest elementary step in a chemical reaction is the rate-limiting step. This step can be used to determine the overall rate law of the chemical reaction. Take a look at the concept map and...

Paul Andersen explains how an overall chemical reaction is made up of several elementary steps. The stoichiometry of this equation can be predicted but the rate law must be measured. If the elementary steps of the reaction are determined...

In this video Paul Andersen explains how the reaction path can be described in an energy profile. Enough energy must be added to reach the activation energy required and stress the bonds. Eventually the bonds break and new bonds are...

In this video Paul Andersen explains that elementary reactions are steps within a larger reaction mechanism. Colliding molecules require sufficient energy and proper orientation to break bonds and form new bonds. A unimolecular reaction...

In this video Paul Andersen describes the characteristics of the rate constant in chemical reactions. The rate constant is highly variable in reactions and must be determined experimentally. The rate constant is dependent on both...

Paul Andersen explains how the rate law can be used to determined the speed of a reaction over time. Zeroth-order, first-order and second-order reactions are described as well as the overall rate law of a reaction. The rate of a reaction...

This lesson will explain the general format of a chemical equation including products, reactants, arrow notation, and states of matter. It is 1 of 2 in the series titled "Chemical Equation: Vocabulary."

This lesson introduces the process of writing the equation for chemical reactions. It is 3 of 9 in the series titled "Chemical Reactions."

This lesson will show that a combustion reaction is a hydrocarbon burned in oxygen to form water and carbon dioxide. It is 1 of 2 in the series titled "Chemical Reaction Types: Combustion."

This lesson will demonstrate how to identify and complete a decomposition reaction. It is 2 of 2 in the series titled "Chemical Reaction Types: Decomposition."

This lesson will demonstrate how to identify and complete a single replacement reaction. It is 1 of 2 in the series titled "Chemical Reaction Types: Single Replacement."

Today, Hank talks about the actual reactions happening in solutions - atoms reorganizing themselves to create whole new substances in the processes that make our world the one we know and love. This week, we focus on acids and bases and...

Chemists need stoichiometry to make the scale of chemistry more understandable - Hank is here to explain why, and to teach us how to use it. [12:48]

A video lecture giving an explanation of Hess's law, the law of heat summation. Understand that whether the process takes places in one or several steps the heat released or absorbed in a chemical process is the same. The video also...

A video lecture that builds on previous knowledge of enthalpy to find out how much heat energy is either gained or lost in a reaction. By being able to predict how much heat it takes to produce certain products, it is explained to...

Khan Academy explores the use of lithium aluminum hydride to prepare alcohols. [11:17]

This narrated screencast explains the role enzymes play in cellular metabolism. [4:42]

Listen to this podcast introducing the function of enzymes in the human body. [0:38]

A crash course episode introducing what the state function is, and how it varies from a path-dependent function; why enthalpy change is different from heat; and the fact that bonds are energy and to form and break them they release and...

Calculate the concentration of weak base using information about equivalence point in a titration. This example is from the 2015 AP Chemistry free response question 3b. [6:16]

See a worked out stoichiometry example problem. [11:36]

Figuring out grams of reactants and product produced from reaction of phosphorous and chlorine. [11:36]

This video [7:30] explains how a catalyst speeds up a chemical reaction by lowering the activation energy.

Explore stoichiometry in this video by making an analogy to the process and making s'mores. Then see a stoichiometry example using a real chemical equation. [3:46]