Curated Video
Diffusion: The Movement of Particles in Liquids and Gases
This is a lecture presentation on diffusion, where the process of diffusion of particles in liquids or gases is explained in terms of kinetic particle theory. The presentation incorporates a mixture of two liquids and a demonstration...
The Business Professor
Management Information Systems Concentration
Management Information Systems Concentration
Curated Video
Concentrations in Moles per Decimeter Cubed: Understanding Molar Concentration and Converting Between Units in mol/dm3
This video covers concentrations in moles per decimeter cubed, explaining the concept of concentration, how to calculate concentration using mass and volume, and why moles are useful in chemistry. The video also covers how to convert...
Professor Dave Explains
Spectrophotometry and Beer's Law
We've learned about kinetics already, but how do we gather kinetic data? One clever method is by analyzing how the color of a solution changes over time, which is an indication of the concentration of certain compounds that interact with...
APMonitor
Chemical Reaction Differential Equations in Python
Concentrations on chemical species from mole balances are solved for 1, 2, and 4 species in Python with the Scipy.Integrate package ODEINT.
National Parks Service
Episode 1: Wildflowers
From foothill elevations to high mountain peaks, hundreds of flower species are found throughout Yosemite National Park. Rangers and scientists discuss the rich botanical history and some of the rare plants found here.
National Parks Service
Yosemite Nature Notes 1: Wildflowers
From foothill elevations to high mountain peaks, hundreds of flower species are found throughout Yosemite National Park. Rangers and scientists describe the rich botanical history and some of the rare plants found here.
Curated Video
Investigating the Effects of Sugar Solutions on the Mass of Plant Material through Osmosis Experiment
This video discusses the required practical activity from the biology specification which involves investigating the effects of different concentrations of sugar solutions on the mass of plant material. The video uses the definition of...
Encyclopaedia Britannica
Encyclopaedia Britannica Presents: WWII Infographic Explainers: Omaha Beach
Hear Encyclopaedia Britannica editor Michael Ray explain the Allied invasion of Omaha Beach during the Normandy Invasion of World War II using infographics.
Professor Dave Explains
Practice Problem: Calculations Involving pH and Ka
We know a bit about acids and bases, including the definitions of pH and pKa, as they relate to an acid-base equilibrium. If we have a weak acid and its concentration, as well as the pH of the solution, can we calculate the Ka for the...
NASA
Hubble Makes Unexpected Dark Matter Discovery
Astronomers seem to have revealed a puzzling detail in the way dark matter behaves. They found small, dense concentrations of dark matter that bend and magnify light much more strongly than expected. Video credit: NASA's Goddard Space...
Professor Dave Explains
Practice Problem: Free Energy and Nonstandard Conditions
We know that a lot of thermodynamic data is collected under standard conditions, but sometimes we will want to assess the free energy change associated with a process that is not occurring under standard conditions. Any other conditions...
Professor Dave Explains
Practice Problem: ICE Box Calculations
Sometimes when we do equilibrium calculations, we have to use an ICE box. Don't worry it won't be chilly, it stands for initial, change, and equilibrium. Let's use this technique to calculate some equilibrium concentrations!
Professor Dave Explains
Practice Problem: Calculating Equilibrium Concentrations
We know how to write equilibrium constant expressions for any equilibrium, and we know that they relate the equilibrium constant to the equilibrium concentrations for all of the substances in the system. Let's see if we can calculate a...
Professor Dave Explains
Practice Problem: Initial Rates and Rate Laws
To figure out the rate law for a reaction, we have to gather kinetic data. We can't know just by looking at the balanced equation. Let's practice using initial rates data to determine the rate law for a reaction!
Professor Dave Explains
Practice Problem: Henderson-Hasselbalch Equation Calculations
David Hasslehoff did chemistry?! No wait, Hasselbalch. And Henderson. Anyway there's this equation, and it relates the pH of a buffer solution to the pKa of the acid and the ratio of the concentrations of the acid and conjugate base....
Catalyst University
Buffers: Henderson-Hasselbalch Proof pH=pKa
Proof that pH=pKa when conjugate acid and base concentrations are equal; proof that conjugate acid and base concentrations are equal when pH=pKa
Catalyst University
Buffers Henderson-Hasselbalch Equation with One Equation One Unknown
Calculation of pH with known species concentration and pKa
Catalyst University
Buffers Henderson-Hasselbalch Equation Using Mass Balance Equation
Henderson-Hasselbalch Equation using mass balance equation for system of two equations with two unknowns
Why U
Algebra 31 - Calculating Mixtures of Solutions
This lecture shows how Algebra is used to solve problems involving mixtures of solutions of different concentrations.
FuseSchool
What Is Dynamic Equilibrium?
Learn about dynamic equilibrium, the conditions required for dynamic equilibrium to be reached and examples of systems at equilibrium.
Professor Dave Explains
Chemical Equilibria and Reaction Quotients
Many chemical reactions don't just go one way, they go forwards and backwards. Once there is balance between the two, this is an equilibrium. And we need to be able to predict how much stuff there will be at equilibrium! Get ready to...
Professor Dave Explains
Plant Responses to the Environment: Tropisms and Defenses
We've already learned a little bit about plant hormones, but let's dig a little deeper so that we can really examine the different ways that plants can respond to stimuli. These are called tropisms, and they can be positive or negative,...