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Videos: 34 results
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
Structures and Conformations  
Molecular models are used to demonstrate the conformations of alkanes and cycloalkanes.
Alkanes / Cycloalkanes |
Molecular Properties / Structure |
Nomenclature / Units / Symbols |
Stereochemistry
Scattering and Absorption of Light  
The effects of passing light through a colloidal suspension of milk in water and through a solution of copper sulfate are shown.
Colloids |
Physical Properties |
Liquids
Light as a Wave: Reflection, Diffraction, Polarization, and Absorption  
The following demonstrations illustrate diffraction, scattering, and absorption of light.
Quantum Chemistry |
Physical Properties
Properties of Gases  
Some properties of gases are demonstrated, including the powerful force of atmospheric pressure and aspects of phase changes.
Gases |
Physical Properties
Viscosity of Liquids  
The viscosities of water, 2-propanol (rubbing alcohol), ethylene glycol (antifreeze) and vegetable oil are compared. The viscosities of water, hexane, octane, 2,2,4-trimethylpentane and 1-pentanol are measured.
Liquids |
Physical Properties
Heat Conduction by Diamond  
Diamond is shown to conduct heat better than aluminum.
Physical Properties |
Calorimetry / Thermochemistry
Floating Squares  
Graphite (from a pencil lead) is applied to one side of an index card and a piece of the card is immersed in a beaker containing hexane and water (two layers). The graphite-coated side always faces the hexane layer. When the two liquids are carbon tetrachloride and water the graphite-coated side always faces the carbon tetrachloride.
Noncovalent Interactions |
Physical Properties
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
Electrical Conductivity-Solids  
The conductivity of various solids are tested.
Conductivity |
Solids |
Physical Properties
Electrical Conductivity-Liquids  
The conductivity of liquids are tested.
Conductivity |
Liquids |
Physical Properties
Structure-Property Relations for Alkanes and Alcohols  
Boiling points of alkanes, miscibility of alcohols, and the vapor pressure and viscosity of several organic compounds are demonstrated.
Alkanes / Cycloalkanes |
Physical Properties |
Alcohols
Effusion of Gases  
Effusion of various gases are compared.
Gases |
Physical Properties |
Transport Properties
Electrical Conductivity-Solutions  
Solutions are measured for conductivity.
Conductivity |
Solutions / Solvents |
Physical Properties
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
Vapor Pressure: Molecular Size  
The vapor pressures of pentane, hexane, and heptane are compared. The vapor pressures of methanol and ethanol are compared. Molecular models of the compounds are shown.
Alkanes / Cycloalkanes |
Noncovalent Interactions |
Physical Properties |
Alcohols
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
Measuring Relative Viscosity  
The rate of flow of six different liquids through a Mohr pipet is measured.
Liquids |
Physical Properties |
Laboratory Equipment / Apparatus
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
Heat Treatment of a Metal Bobby Pin  
A bobby pin is subjected to various heat treatments.
Metallic Bonding |
Metals |
Solids |
Physical Properties
Memory Metal  
When a piece of metal wire spelling the letters ICE is pulled apart, it deforms. When the wire is placed in hot water, it "remembers" its original shape, once again forming the letters ICE. (The memory metal used in this demonstration was provided by the Institute for Chemical Eduction.) A simulation of the processes at the atomic level is shown.
Metals |
Physical Properties |
Solid State Chemistry
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
Like Dissolves Like - Demonstration  
Some substances dissolve readily in others. Some substances do not. Some substances are more dense than others.
Noncovalent Interactions |
Physical Properties |
Precipitation / Solubility
Like Dissolves Like - Multimedia Experiments  
There are a total of six experiments you can view. You can view them in any order, as many times as you wish. Each experiment has three steps.
Noncovalent Interactions |
Physical Properties |
Precipitation / Solubility
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
Conductivity of Aqueous Acids, Bases, and Salts  
The conductivity of carboxylic acid solutions is tested with a conductivity apparatus.
Acids / Bases |
Carboxylic Acids |
Physical Properties |
Water / Water Chemistry
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
Hardness of Solid Substances  
The hardness of various solids are compared.
Covalent Bonding |
Nonmetals |
Physical Properties |
Solids |
Noncovalent Interactions
Hardness of Solid Substances - Grinding  
A number of metals and nonmetals are ground with a mortar and pestle. The nonmetals shown here are all soft (due to weak intermolecular forces), but the metals vary in hardness.
Covalent Bonding |
Nonmetals |
Physical Properties |
Solids |
Metallic Bonding |
Metals
Isotopes: Heavy Water Ice Cubes  
An H2O ice cube is shown to float in a beaker of liquid water, while an ice cube of D2O (heavy water) is shown to sink in liquid water.
Hydrogen Bonding |
Isotopes |
Physical Properties |
Atomic Properties / Structure |
Water / Water Chemistry
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
Solutions  
Reactions and demonstrations exploring the concepts of solutions.
Noncovalent Interactions |
Physical Properties |
Precipitation / Solubility |
Solutions / Solvents |
Calorimetry / Thermochemistry |
Applications of Chemistry |
Acids / Bases |
Aqueous Solution Chemistry |
pH |
Conductivity |
Reactions |
Titration / Volumetric Analysis |
Liquids |
Solids |
Equilibrium |
Transport Properties
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