| Videos: 27 results |
Atmospheric Pressure
Atmospheric pressure is used to collapse large and small metal containers.
Phases / Phase Transitions / Diagrams |
Gases |
Atmospheric Chemistry
|
Vapor Pressure
Pressure exerted by vapor of several organic substances is demonstrated using barometers. Molecular models of the substances are shown.
Gases |
Phases / Phase Transitions / Diagrams |
Physical Properties
|
Vapor Pressure: Molecular Size
The measurement of pressure exerted by a vapor is demonstrated using barometers. Vapor pressure varies with the strength of the intermolecular forces in the liquid.
Gases |
Liquids |
Noncovalent Interactions |
Phases / Phase Transitions / Diagrams |
Physical Properties
|
Vapor Pressure of a Mixture: Raoult's Law
The measurement of pressure exerted by a vapor is demonstrated using barometers. Vapor pressure varies with the strength of the intermolecular forces in the liquid.
In this section we will look at vapor pressure of mixtures. We can calculate the vapor pressure of a mixture using Raoult's law.
Gases |
Liquids |
Noncovalent Interactions |
Phases / Phase Transitions / Diagrams |
Physical Properties
|
Atmosphere
Topics associated with the atmosphere include atmospheric pressure, pollution and the role of ozone.
Gases |
Atmospheric Chemistry
|
Properties of Gases
Some properties of gases are demonstrated, including the powerful force of atmospheric pressure and aspects of phase changes.
Gases |
Physical Properties
|
Oscillating Reaction: Belousov-Zhabotinskii - Time-Lapse
Time-lapse versions of the Belousov-Zhabotinskii reaction taking from 10 to 60 seconds are presented.
Kinetics
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Oscillating Reaction: Belousov-Zhabotinskii
Belousov-Zhabotinskii reactions are shown both as movies and as stills.
Kinetics
|
Rates of Reactions
The effects of a variety of variables, including concentration, temperature and catalysts, on reaction rate are shown.
Kinetics
|
Gas Stoichiometry
Gas is generated from one mole of liquid of solid and the volume is measured using a gas collection system.
Stoichiometry |
Gases
|
Enthlapy-Thermodynamics
Reactions and demonstrations the explore thermodynamic concepts.
Precipitation / Solubility |
Solutions / Solvents |
Calorimetry / Thermochemistry |
Applications of Chemistry |
Acids / Bases |
Physical Properties |
Reactions |
Thermodynamics |
Gases |
Phases / Phase Transitions / Diagrams |
Water / Water Chemistry |
Liquids |
Solids |
pH |
Consumer Chemistry |
Kinetics |
Oxidation / Reduction
|
Atmospheric Pollution
The formation and effects of acid rain and other pollutants are simulated.
Atmospheric Chemistry |
Gases
|
Hydrogen + Chlorine Cannon
When a corked test tube containing a mixture of hydrogen and chlorine is struck by light from a burning magnesium ribbon, the resulting explosion propels the cork out of the test tube.
Gases |
Photochemistry |
Reactions
|
Chemical Properties of Sulfur Dioxide
Reactions involving sulfur dioxide.
Gases |
Reactions |
Oxidation / Reduction
|
Big Barometer
This is a demonstration of an eleven foot high barometer made with a concentrated solution of potassium tetraiodomercurate(II). A second movie compares the densities of mercury, potassium tetraiodomercurate(II) solution, and water.
Gases |
Physical Properties
|
Relative Reactivity: Strong Acid, Weak Acid, Buffer Solution
A strong acid, a weak acid, and a buffer solution are each added to sodium bicarbonate and the reaction rates are compared.
Acids / Bases |
Kinetics |
pH
|
Iodine Clock Reaction
A solution of hydrogen peroxide and sulfuric acid is added to a solution containing iodide ion, thiosulfate ion, and starch. After some time the dark blue color of a triiodide-starch complex is observed. The influences of initial reactant concentrations on the reaction time are examined, as are the influence of volume and temperature.
Kinetics |
Oxidation / Reduction
|
Steam and Superheated Steam
When a gas burner heats the steam coil strongly, the steam becomes superheated and is at a high enough temperature to ignite a match and react quickly with steel wool
Gases |
Phases / Phase Transitions / Diagrams
|
Effusion of Gases
Effusion of various gases are compared.
Gases |
Physical Properties |
Transport Properties
|
Factors Affecting Glucose Oxidase Activity
Various factors which affect glucose oxidase activity are demonstrated.
Catalysis |
Enzymes |
Kinetics |
Proteins / Peptides
|
Halting the Briggs-Rauscher Oscillating Reaction
The Briggs-Rauscher reaction is demonstrated in three different ways. Catalase from a liver extract decomposes the hydrogen peroxide in an Briggs-Rauscher reaction, stopping the oscillations.
Catalysis |
Kinetics |
Enzymes |
Proteins / Peptides
|
Blue Bottle, Red and Blue Bottle
Color changes are caused by reactions of oxygen in the air with chemicals in a solution. The colors fade over time, but can be regenerated by shaking the flask containing the solution.
Kinetics |
Mechanisms of Reactions |
Oxidation / Reduction
|
Boiling by Cooling
A flask contains water and water vapor at 100C. Each time ice water is poured over the outside of the flask, the water inside the flask boils. Although the temperature of the water in the flask has decreased, in each instance boiling is observed.
Gases |
Liquids |
Phases / Phase Transitions / Diagrams
|
Oscillating Reaction: Briggs-Rauscher
When a solution of malonic acid, starch, and manganese(II) ion is added to a solution of hydrogen peroxide, iodate ion, and sulfuric acid, gas bubbles form and the color of the resulting mixture oscillates periodically from colorless to amber to blue.
Kinetics |
Oxidation / Reduction |
Electrolytic / Galvanic Cells / Potentials
|
Energy from Oxidation of Food
Food undergoes rapid oxidation when placed in molten potassium chlorate.
Calorimetry / Thermochemistry |
Kinetics |
Oxidation / Reduction |
Reactions |
Nutrition
|
Induction by Iron(II) of the Oxidation of Iodide by Dichromate
Acidic aqueous solutions containing dichromate and iodide ions are mixed with no reaction. The addition of a solution of iron(II) ion induces the rapid formation of brown triiodide ion.
Catalysis |
Kinetics |
Mechanisms of Reactions |
Oxidation / Reduction
|
Acid Base Reactions of Sulfur Dioxide
Acid base reactions involving sulfur dioxide are shown.
Acids / Bases |
Gases |
Reactions |
Oxidation / Reduction |
Precipitation / Solubility |
Descriptive Chemistry |
Applications of Chemistry
|
