Khan Academy
Khan Academy: Chemistry: Suspensions, Colloids, and Solutions
A video lecture discussing the properties of homogeneous mixtures and how to distinguish between the different types. Understand that homogeneous mixtures that have large particles that eventually settle to the bottom are known as a...
Khan Academy
Khan Academy: Chemistry: Reaction in Equilibrium
In this video module explore how equilibrium in a chemical reaction is defined as when the rate going forward is equal to the rate of the reverse reaction. Also learn how to calculate the equilibrium constant by knowing the concentration...
Khan Academy
Khan Academy: Chemistry: P H, P Oh of Strong Acids and Bases
A video lecture giving examples of how to find the pH and pOH of strong acids and bases. Also learn how to calculate the pKw of water. [14:49]
Khan Academy
Khan Academy: Chemistry: Strong Acid Titration
A video explaining an acid-base titration showing the titration curve produced by a strong acid. Understand how a titration can help you find an initial concentration of either the acid or base. Also learn that by finding the equivalence...
Khan Academy
Khan Academy: Chemistry: P H of a Weak Acid
This video explains how to calculate the pH of a weak acid. Understand how to use the acid constant to find the pH when an acid doesn't completely disassociate. [17:49]
Khan Academy
Khan Academy: Chemistry: Weak Acid Titration
Understand how to interpret a titration curve for a weak acid with this video module. Also learn how to calculate the concentration of the acid being titrated. The video also explains the equivalence point and what its pH tells you about...
Khan Academy
Khan Academy: Chemistry: Molecular and Empirical Formulas
A video lecture explaining the difference between the molecular and empirical formula. The video also shows how to calculate the molecular mass of a compound. [15:54]
Khan Academy
Khan Academy: Chemistry: Another Stoichiometry Example in a Solution
A video lecture showing a procedure for completing a stoichiometry problem where the reaction is occuring inside a solution. The problem is a standard problem found in a textbook and a step by step explanation is given for solving it....
Khan Academy
Khan Academy: Chemistry: Macrostates and Microstates
A video lecture exploring the difference between macrostates, microstates, and thermodynamic equilibrium. Understand how macrostates is best defined when the system is in thermal equilibrium and describes pressure, temperature, and...
Khan Academy
Khan Academy: Chemistry: Example of Finding Reactant Empirical Formula
A video lecture solving a problem to find the empirical formula based on a chemical reaction. To find the empirical formula the video gives a step-by-step procedure to figure out the equation, molar mass, and the empirical formula. [17:41]
Khan Academy
Khan Academy: Chemistry: More Rigorous Gibb's Free Energy
A video lecture that derives the Gibb's free energy equation. The video starts by reviewing what a irreversible and reversible process is with explanations and diagrams. While describing irreversible and spontaneous process the formula...
Khan Academy
Khan Academy: Chemistry: Hess's Law Example
A video lecture showing a step by step procedure for solving a Hess's law problem from a textbook. The problem instructs students to find the enthalpy change using the heat of formation. [12:08]
Khan Academy
Khan Academy: Chemistry: Van Der Waals Forces
A video lecture discussing the Van Der Waals Forces: London Dispersion Forces, Dipole Attractions, and Hydrogen Bonds. [11:39]
Khan Academy
Khan Academy: Chemistry: Carnot Cycle and Carnot Engine
A video lecture discussing the four processes of the Carnot cycle. Each step of the process is described and illustrated relating the temperature change and whether heat was absorbed or released. Also explained is the P-V diagram for the...
Khan Academy
Khan Academy: Chemistry: Maxwell's Demon
A video lecture explaining that the Maxwell's "demon" does not contradict the second law of thermodynamics. Video begins by reviewing the second law of thermodynamics which states that the universe tends to move towards more entropy....
Khan Academy
Khan Academy: Chemistry: More on Internal Energy
A video lecture that explores internal energy and how to calculate how much heat is transferred to or from the system. Lecture gives examples to help your understanding of the concepts. [13:45]
Khan Academy
Khan Academy: Chemistry: Hess's Law and Reaction Enthalpy Change
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...
Khan Academy
Khan Academy: Chemistry: More on Entropy
A video lecture describing how entropy is a macrostate variable that also describes the number of states a system can take on. The video explains some misconceptions about previous given analogies to describe entropy. [9:30]
Khan Academy
Khan Academy: Chemistry: Stoichiometry of a Reaction in Solution
A video lecture investigating how to solve problems using stoichiometry. The lecture shows viewers step-by-step how to solve for the mass needed of a substance in order for it to completely react with a solution. [10:18]
Khan Academy
Khan Academy: Chemistry: Stoichiometry Example Problem 2
A video lecture showing step-by-step how to solve a stoichiometry problem. The problem gives you a given number of grams of a molecule, and ask you to solve for how much of another molecule would be to required to completely react with...
Khan Academy
Khan Academy: Chemistry: Enthalpy
A video lecture explaining enthalpy is the heat applied to a system if the pressure is constant in the system. Also explored is internal energy and when the pressure of a system would be constant. [15:07]
Khan Academy
Khan Academy: Chemistry: Exponential Decay Formula Proof
A video lecture showing how a general function of time can give you the amount of the decaying substance. The video derives the function and explains the logic along the way. Some calculus is involved. [12:22]
Khan Academy
Khan Academy: Chemistry: Mini Video on Ion Side
A correction to a previous video on solubility about the size of the sodium ion versus a chlorine ion. A sodium ion is smaller in size compared to chlorine. [3:04]
Khan Academy
Khan Academy: Chemistry: More Exponential Decay Examples
Do you need some more practice on half life problems? This video lecture will give you more examples of how to solve exponential decay problems. The video is easy to follow with step-by-step explanation of how to find the half life or...