| Videos: 15 results |
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
|
Conductivity Meter
The use of a conductivity meter is demonstrated.
Conductivity |
Laboratory Equipment / Apparatus
|
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
|
Electrical Conductivity-Solutions
Solutions are measured for conductivity.
Conductivity |
Solutions / Solvents |
Physical Properties
|
Conductimetric Titration
Aqueous sulfuric acid and barium hydroxide both conduct electricity; distilled water does not. As barium hydroxide solution is added to sulfuric acid, conductivity decreases until it reaches zero at the equivalence point. As excess barium hydroxide is added, the conductivity gradually increases.
Acids / Bases |
Conductivity |
Titration / Volumetric Analysis
|
Simulation of Dislocations in Metals
An array of soap bubbles is used to simulate a close-packed arrangement of atoms in a metal crystal.
Metallic Bonding |
Metals |
Solids
|
Electrical Properties
Use of the conductivity meter and techniques for measuring voltage of electrochemical cells are demonstrated.
Conductivity |
Laboratory Equipment / Apparatus |
Electrolytic / Galvanic Cells / Potentials
|
Electrolysis
Various examples of electrolysis are presented.
Aqueous Solution Chemistry |
Electrochemistry |
Oxidation / Reduction |
Water / Water Chemistry |
Acids / Bases |
pH |
Conductivity
|
Ferrofluid
A magnet placed just below a dish containing ferrofluid generates an array of spikes in the fluid.
Liquids |
Magnetic Properties |
Metals |
Atomic Properties / Structure
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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
|
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
|
Oxidation-Reduction (Redox) Reactions
Demonstrations exploring oxidation/reduction chemistry.
Aqueous Solution Chemistry |
Electrochemistry |
Oxidation / Reduction |
Water / Water Chemistry |
Acids / Bases |
pH |
Conductivity |
Reactions |
Applications of Chemistry |
Descriptive Chemistry |
Electrolytic / Galvanic Cells / Potentials |
Laboratory Equipment / Apparatus
|
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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