| Videos: 22 results |
Discovery Videos Lyubov Hoffman Laroche, Gary Wulfsberg, Barbara Young
The use of digital video for instruction has many advantages. In many situations the only way to present some chemical phenomena is through the use of video. The two video lessons presented here are examples intended to supplement our article in the August 2003 issue of JCE.
Descriptive Chemistry |
Periodicity / Periodic Table
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Paramagnetism: Compounds
Vials of a number of compounds (NaCl, MnSO4, FeSO4, CoCl2, NiSO4, ZnSO4, K4Fe(CN)6, [Co(NH3)6]Cl3, [Ni(NH3)6]Cl2, and H2O) are hung from a thread. When a magnet is brought near, some of the vials are attracted.
Magnetic Properties |
Atomic Properties / Structure
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Paramagnetism: Oxidation States of Manganese
Manganese(III) oxide, with 4 unpaired electrons per Mn atom, is more strongly attracted to a magnet than is manganese(IV) oxide, with only 3 unpaired electrons per Mn atom. Potassium permanganate, a compound of Mn(VII), has no unpaired electrons and is not attracted to a magnet.
Magnetic Properties |
Atomic Properties / Structure
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Electronic Structure-Periodic Table
Reactions exploring the concepts of atomic structure.
Atomic Properties / Structure |
Descriptive Chemistry
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Ferrimagnetism
Precipitation reactions are used to produce iron(III) oxide (Fe2O3 called hematite) and mixed iron(II)/iron(III) oxide (Fe3O4 called magnetite). The particles in the slurry of hematite are not attracted to a magnet, but the particles in the slurry of magnetite are.
Magnetic Properties |
Atomic Properties / Structure
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Colors of Elements in a Flame
Aqueous solutions of various compounds are sprayed into a Meeker burner flame from an atomizer.
Atomic Properties / Structure |
Descriptive Chemistry |
Spectroscopy
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Paramagnetism: Nitrogen and Oxygen
A magnet is shown to strongly attract a pair of metal tongs. The magnet has no visible effect on liquid nitrogen, but when pale blue liquid oxygen is poured near the poles of the magnet, it shows definite attraction.
Magnetic Properties |
Atomic Properties / Structure |
Liquids
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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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Bonding
Reactions and demonstrations that explore the concepts of bonding.
Molecular Properties / Structure |
Atomic Properties / Structure
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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
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Electrochemistry
Reactions exploring electrochemical concepts.
Electrochemistry
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Electrolysis-Water
This experiment demonstrates the electrolysis of water.
Electrochemistry |
Water / Water Chemistry
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Electrolysis of Aqueous Solutions -- Original
Electrolysis of several aqueous solutions is carried out using a 9-V battery and pencil leads as electrodes. Because only the electrodes are shown in the videos, it is important to show these still images  
or describe how the reactions were performed if students are to make sense of the videos. In each case the anode is on the left and a 9-V battery has been connected to the lead of each of the pencils near the eraser end with an alligator clip. A newer version of most of these reactions using platinum electrodes is available as Electrolysis of Aqueous Solutions -- New.
Aqueous Solution Chemistry |
Electrochemistry
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Overvoltage
Zinc metal reacts with hydrochloric acid, generating hydrogen gas. However, when a strip of nickel, copper, platinum or lead is placed in hydrochloric acid, no reaction is observed.
Descriptive Chemistry |
Electrochemistry
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Metal-Iodine Reactions and Cells
Electrochemical reactions are demonstrated and then used to do work.
Electrochemistry |
Electrolytic / Galvanic Cells / Potentials
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Gas Producing
Electrolysis of solutions with only gas(es) produced is shown.
Aqueous Solution Chemistry |
Electrochemistry |
Oxidation / Reduction
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Tin Compounds
Electrolysis of tin(II) and tin(IV) solutions of different concentrations is shown.
Aqueous Solution Chemistry |
Electrochemistry |
Oxidation / Reduction
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Solid Producing
Electrolysis of solutions in which a solid is produced is shown.
Aqueous Solution Chemistry |
Electrochemistry |
Oxidation / Reduction
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Electrolysis of Aqueous Solutions -- New
This is a revised version of the previously published Electrolysis of Aqueous Solutions, providing corrections and additional images. In order to understand most of these videos it is important to either see the Complete Experiment: Electrolysis of an Aqueous Solution video or to be able to read a description of that video (such as the one in the Discussion section for that video).
Aqueous Solution Chemistry |
Electrochemistry |
Oxidation / Reduction
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HCl, NaOH, NaCl and Water
Electrolysis of HCl, NaOH and NaCl solutions and of water is shown.
Aqueous Solution Chemistry |
Electrochemistry |
Oxidation / Reduction |
Water / Water Chemistry
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Electrochemical Series: Metal Trees
A piece of metal (Cu, Zn, Ag, Cd, or Pb) is placed in an aqueous solution of a metal ion (Cu2+, Zn2+, Ag+, Cd2+, or Pb2+). In some cases the growth of metal crystals indicates that a chemical reaction has occurred.
Aqueous Solution Chemistry |
Oxidation / Reduction |
Electrolytic / Galvanic Cells / Potentials |
Electrochemistry
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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
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