Summary: Two very important products derived from air are ammonia and nitric acid. Ammonia is produced when hydrogen gas is extracted from natural gas and steam, mixed with nitrogen from the air, and heated. The resulting ammonia gas is condensed into liquid form, to be made into other chemicals. Ammonia is also used to make nitric acid, basic in the production of fertilizers, detergents, and many other...
Format: software, multimedia
Publisher / Publication Date: Films Media Group 2007
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Summary: When is a mole not a mole? Section one of this program demystifies concepts such as Avogadro's Constant, molecular mass, and molar mass. In section two, the Percent Composition Formula is spotlighted, while section three addresses the Empirical Formula and its use in determining formula weight. The calculation of mass in the conversion of magnesium to magnesium oxide in a segment called...
Format: software, multimedia
Publisher / Publication Date: Films Media Group 2005
View online at AVOD
Summary: Air, an important industrial raw material, is first filtered to remove any solid matter. Then its constituent gases-nitrogen, oxygen, and other trace gases-can be separated by compressing the air, cooling it, and then allowing it to expand, which cools it further. Since each gas liquefies at a different temperature, the gases can easily be separated. As the air expands, it is used to drive...
Format: software, multimedia
Publisher / Publication Date: Films Media Group 2007
View online at AVOD
Summary: Can a barbershop quartet introduce the subject of stoichiometry? They do in this program, which in section one presents the Law of Conservation of Mass and how to balance equations. Section two explains the difference between the mass number and atomic mass, what an isotope is, and how to work with atomic mass units to find the average atomic mass.
Format: software, multimedia
Publisher / Publication Date: Films Media Group 2005
View online at AVOD
Summary: This program considers the bonds formed when atoms share electrons (covalent bonding) The idea of filling electron shells to reach a more stable state is used to explain the formation of simple molecules such as water and methane. Shapes of molecules are explained by considering the repulsion between molecular orbitals. Further shapes are illustrated using CH4, NH3, and NH4. Double bonds (O2)...
Format: software, multimedia
Publisher / Publication Date: Films Media Group 2005
View online at AVOD
Summary: This program, divided into three parts, looks at the difference between melting and dissolving using the example of sodium chloride. The reaction of sodium chloride solution with silver nitrate exemplifies precipitation; ammonia, added to a solution of copper (II) nitrate, forms a copper (II) hydroxide gel; and the successive complexation of copper (II) by ammonia molecules serves as an...
Format: software, multimedia
Publisher / Publication Date: Films Media Group 2008
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Summary: Use this video to familiarize students with the properties of acids and bases. Beginning with an overview of how these two kinds of chemicals react to or neutralize each other, the program explores Arrhenius's ideas on ion release and Lowry and Bronsted's theory of proton exchange. Details on the pH scale, indicators, conjugate bases, and Lowry-Bronsted reactions are featured along with...
Format: software, multimedia
Publisher / Publication Date: Films Media Group 2006
View online at AVOD
Summary: Lesson one looks at copper atoms using a Scanning Tunneling Microscope connected to a computer. Several demonstrations of combustion include burning firecrackers under water. Lesson two shows combustion of an industrial diamond. Thermite reaction produces iron metal from iron oxide. Tatara, the traditional Japanese steelmaking process, is described. Lesson three studies chemical reactions...
Format: software, multimedia
Publisher / Publication Date: Films Media Group 2005
View online at AVOD
Summary: Using computer-generated animations, this program clearly demonstrates the structures and changes of state in water-specifically in ice melting, in water evaporating, and in water boiling-all at the molecular level. Each demonstration scientifically clarifies student misconceptions about the process and reinforces concepts that carry over into molecular change in other elements.
Format: software, multimedia
Publisher / Publication Date: Films Media Group 2008
View online at AVOD
Summary: This program, divided into three parts, gives several examples of reactions: potassium thiocyanate solution with iron (III) nitrate solution to explain ionic equilibrium; acid-base chemistry, using ethanoic acid as an acid, and ethanoate ion and ammonia as bases; and copper metal with silver nitrate solution to illustrate redox chemistry.
Format: software, multimedia
Publisher / Publication Date: Films Media Group 2009