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The Percentage Composition Module

This is a 'Practice' module, and it contains only one program at present. The objective is to calculate the percentage composition of a compound - given its formula. Later versions of the program will include mass/mass, mass/volume and volume/volume percentage composition of solutions. Help is available at each stage - getting the molar mass and setting up unit factor and you can always peek at the expected answer. Your answer can be given in either decimal or scientific notation and there is always an on-screen Text reference (which can be hidden). The Help is presented in interactive screens, which you can reach by clicking on the 'Help' button and then selecting an item from the pop-up menu which appears. You can also give yourself a Test - by clicking on the 'Test' button. You will be presented with 10 questions. You supply the answers and after the test is complete, you will be able to review your answers and see the feedback for each one. The 'Test' mode is not available in this demo version 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 'Practice' button - click to work in practice mode - work as many examples as you like The 'Test' button - click to work in Test mode - where you will be given one of three tests containing 10 The 'Restart' button - clears the scoreboard and starts a new series of exercises

The 'Judge' button - click this to have your answer checked The 'Peek' button - this appears after you have made three unsuccessful attempts at answering a question The 'Text' and 'Hide Text' buttons - can be used to show and hide the Text reference

The 'Quit Practice' button - not active in this demo, it would return you to the CheMentor main menu The 'Activity Menu' button - returns you to the menu for the module so that you can select another type of exercise The 'Help' button - clicking on this causes the Help Menu to pop up and you can then select a Help screen for some stage of the problem

Link to the other modules ...