Overview of CheMentor Introduction Objectives Role of the student Role of the software Design Elements Types of Module The Menu System Individual Modules - details and on-line samples: Significant Figures Unit Factors Isotopes Ion Recog/Writing Formulae Rec/Writg Mass/Mole Conversions %Composition (Cmpds) Oxidation Numbers Periodic Table Ions Reference Molar Mass Calculator Empirical and Molecular Formulae Reviews of CheMentor Pricing and Ordering Download a Demo CheMentor Home Page

Oxidation Numbers

This is a 'Practice' module, consisting of one program. Using a database of 208 compounds and ions, the program selects an ion or compound at random and asks you to work out the oxidation number (state) for one of the elements present in the formula. The rules for assigning oxidation numbers are presented by clicking on the 'Rules' button. These may be hidded if you like. Each Rule is displayed by your clicking on a 'More' button and as this is done, the on-screen Text reference scrolls to provide more information that is relevant to the rule being displayed. You can show or hide the Text and the Rules at any time. After you have entered your answer, click on the 'Judge' button and see the feedback. You can always 'Peek' at the solution to the problem - a window will be displayed showing how the oxidation number was worked out. Try out the program - it should have appeared in the area below. About the buttons you will see on the screen ...

The 'New' button - generates a new exercise The 'Rules' button - displays the Rules window and also the 'More' button The 'Hide Rules' button - removes the Rules window and hides the 'More' button

The 'Judge' button - click this to have your answer checked The 'Peek' button - click on this at any time to see the correct answer and how it was worked out The 'Text and Hide Text'' buttons - these show and hide the Text reference

The 'Quit Practice' button - not active in this demo, it would return you to the CheMentor main menu

Link to the other modules ...