| This program portrays the structures and changes of state of the most important compound of all: water. By using computer-generated animations we see ice melting, water evaporating, and water boiling, all at the molecular level, addressing well established student misconceptions in the process. 07DR JSCA 22 min. |
| This program is divided into three sections, each moving from the laboratory level, to the molecular level and then to the symbolic level. Following an introduction to these three thinking levels, we imagine what is happening in a simple ionic equilibrium - thiocyanate ions attaching to hydrated iron (III) ions, as attached thiocyanate ions break away from other hydrated iron (III) ions. Then we see what happens when fluoride ions are added to the equilibrium system. The next section on acids and bases shows the autoprotolysis of water, and the effect of iron (III) on acidity of a bonded water molecule. The equilibrium reactions of ammonia molecules and ethanoic acid molecules with water molecules are also portrayed in animations. The last section deals with oxidation/reduction chemistry - the reaction of copper metal, visualized as copper (II) ions in a 'sea of electrons', with silver nitrate solution. 07DR JSCA 35 min. |
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"Recommended. A surprising number of aqueous chemistry
principles are packed into this program. Each transformation is shown at a
lab scale in test tubes followed by an exceptionally clear description and
visualization (animation) at a molecular level. Helpful summaries are
provided at the end of each section. This program would make an ideal
classroom introduction to simple laboratory experiments exploring these
topics." -EMRO Review This three-part program looks at the difference between melting and dissolving using the example of sodium chloride. After presenting a brief navigation map and advance organizer, the program examines: 1) the reaction of sodium chloride solution with silver nitrate to exemplify precipitation; 2) ammonia, added to a solution of copper (II) nitrate to form a copper (II) hydroxide gel; and 3) the successive complexation of copper (II) by ammonia molecules, which serves as an important model for complexation. 07DR JSCA 15 min. |