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Videos: 25 results
Structures and Conformations  
Molecular models are used to demonstrate the conformations of alkanes and cycloalkanes.
Alkanes / Cycloalkanes |
Molecular Properties / Structure |
Nomenclature / Units / Symbols |
Stereochemistry
Phase Changes  
By using a coolant at a temperature below the boiling point of the gases chlorine, bromine and iodine, the gases are condensed into liquid form.
Phases / Phase Transitions / Diagrams
Critical Point of Benzene  
A sealed tube containing benzene liquid and vapor is heated. As the critical temperature is approached, the meniscus flattens. At the critical temperature the meniscus disappears, and separate liquid and vapor phases can no longer be detected.
Phases / Phase Transitions / Diagrams
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
Superconductivity  
A pellet of 1-2-3 yttrium barium copper oxide (YBa2Cu3O7-x) is cooled with liquid nitrogen. A magnet placed above the pellet is levitated. At a higher temperature the magnet rests on the pellet, but cooling once again causes the magnet to rise. The levitated magnet is spun with plastic tweezers
Phases / Phase Transitions / Diagrams |
Superconductivity
Vapor Pressure: Drinking Bird  
A novelty store "Drinking Bird" repeatedly dips is beak into a beaker of water and then bobs back to an upright position. Visible movement of a liquid in the bird's body accompanies the bobbing; the movement is caused by changing vapor pressure of the liquid due to different temperatures at the bird's head and the bird's body.
Liquids |
Phases / Phase Transitions / Diagrams
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
Liquefaction of Carbon Dioxide  
Dry ice is placed into an acrylic plastic cylinder. A valve is closed and pressure in the cylinder increases. When the pressure reaches 350 kPa (50 psi) it stops increasing and liquid CO2 appears.
Equilibrium |
Phases / Phase Transitions / Diagrams |
Physical Properties
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
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
Thermochromism: Mercury(II) Iodide  
When red-orange Mercury(II) Iodide (HgI2) is heated, it undergoes a phase transition at 126oC to a pale yellow form. As the heated sample cools, it gradually returns to the original red-orange color.
Crystals / Crystallography |
Phases / Phase Transitions / Diagrams |
Physical Properties |
Solid State Chemistry |
Solids |
Descriptive Chemistry
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
Paramagnetism  
The paramagnetic properties of oxygen are demonstrated using a strong magnet, and compared with diamagnetic nitrogen.
Magnetic Properties |
Molecular Properties / Structure
Boiling Points of Straight-Chain Alkanes  
The boiling points of straight-chain alkanes with 5-10 carbon atoms are determined.
Alkanes / Cycloalkanes |
Molecular Properties / Structure |
Physical Properties
Glyceraldehyde and the Fischer Projection  
Molecular models are used to demonstrate chirality of glyceraldehyde and drawing its Fischer Projection.
Chirality / Optical Activity |
Stereochemistry |
Molecular Properties / Structure
Plastic Sulfur  
Yellow powdered sulfur is heated until it becomes molten and brown. At first it flows freely, but then it becomes very viscous. Upon further heating, the viscous sulfur flows freely again and ignites. The burning liquid sulfur is poured into a beaker of water. When removed from the water, the sulfur is rubbery and flexible.
Molecular Properties / Structure |
Physical Properties |
Solids
Ring Strain  
Mixing solid iodine and cyclohexene shows little reaction but mixing iodine and alpha-pinene produces a very vigorous exothermic reaction and sublimation of solid iodine to dense iodine vapor.
Addition Reactions |
Molecular Properties / Structure |
Applications of Chemistry
Bonding  
Reactions and demonstrations that explore the concepts of bonding.
Molecular Properties / Structure |
Atomic Properties / Structure
Boiling Points of Hexane Isomers  
The boiling points of the five isomers of hexane are determined.
Alkanes / Cycloalkanes |
Molecular Properties / Structure |
Constitutional Isomers |
Physical Properties
Relation of Structure to Boiling Point of Alkanes  
The boiling point of straight-chain alkanes and isomers of hexane are determined and molecular models of the hydrocarbons are shown.
Alkanes / Cycloalkanes |
Molecular Properties / Structure |
Physical Properties |
Constitutional Isomers
pH of Acetic Acid Derivatives  
The pH of acetic acid, monochloro-, dichloro-, trichloro-, and trifluoroacetic acids are compared.
Acids / Bases |
Carboxylic Acids |
pH |
Physical Properties |
Molecular Properties / Structure
Piezoelectric Effect  
Sounds accompany the discharges of electricity. A piezoelectric crystal is connected to a light bulb. When the crystal is pressed, the light flashes.
Crystals / Crystallography |
Molecular Properties / Structure |
Solid State Chemistry |
Solids
Hydrophobic Effect  
Hydrophobic Effect: Octanoic acid forms a monolayer on the surface of water under certain conditions.
Alkanes / Cycloalkanes |
Carboxylic Acids |
Molecular Properties / Structure |
Water / Water Chemistry |
Noncovalent Interactions