| Videos: 18 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
|
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
|
Pressure
Use of a mercury barometer and a McLeod gauge manometer are demonstrated.
Laboratory Equipment / Apparatus
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Distillation at Reduced Pressure
Distillation under partial vacuum is demonstrated.
Laboratory Equipment / Apparatus
|
Barometer
The use of a mercury barometer to measure air pressure is demonstrated.
Laboratory Equipment / Apparatus
|
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
|
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
|
Distillation
Here we consider distillation including simple distillation, distillation at reduced pressure and using a rotary evaporator.
Laboratory Equipment / Apparatus |
Separation Science
|
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
|
Measuring
Measurement of electrical properties, mass, pH, pressure, volume, and temperature are demonstrated along with examples of recording data, spectroscopy, and titration.
Laboratory Equipment / Apparatus |
Quantitative Analysis
|
Orange Tornado: Precipitation of Mercury(II) Iodide - Version 1
When mercury(II) nitrate and potassium iodide are combined with rapid stirring, an orange tornado of mercury(II) iodide is formed.
Equilibrium |
Precipitation / Solubility |
Reactions
|
Orange Tornado: Precipitation of Mercury(II) Iodide - Version 2
When mercury(II) nitrate and potassium iodide are combined with rapid stirring, an orange tornado of mercury(II) iodide is formed.
Equilibrium |
Precipitation / Solubility |
Reactions
|
Precipitation Reactions
Two versions of the Orange Tornado, two reactions under a microscope, and updated stills of other precipitation reactions provide dramatic visual displays of solid formation.
Equilibrium |
Precipitation / Solubility |
Reactions
|
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
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