ChemCure tutorial

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This document will provide help in using all of my chemistry programs

  DISCLAIMER: I AM NOT RESPONSIBLE TO ANY DAMAGE THESE PROGRAMS MAY DO TO YOUR CALCULATOR

This program is freeware, but please if you’re using it send me mail with your comments about it.

With information you provide me, I will improve and add other programs that will meet your needs in solving chemistry problems.

If you make any changes or improvements in any of following programs, please mail it to miljen@zagreb.zoak.pmf.hr

Note: If you find any incorrect information in any of my programs, please mail me immediately, so I can correct them.

INSTALLATION:

Put standard vesion of ChemCure to your calc ("standard.85g").  
I encourage you to look at all codes and see what does each program do. There are some extra programs that you'll have to put yourself when you'll need them. That's why you need to know what each program does.

This is version 2.1

Version 2.1  uses following programs:
 

  How to use these programs

Above were basics about every program. In this section I'll try to explain what some specific programs do and how do they do it. The power of this program lies in you, it's just here to help you find your way through chemistry. It suites all levels of chemistry. From middle school students, all the way up to chemistry majors.

As a student who will major in chemistry, I'm trying to make programs to suite my needs in Croatia as well as yours in US, Canada, Latin America, Africa, Australia, Asia ...  Please understand, there may be some bugs, programs passed all tests for AP chemistry, but they may not pass yours. Please report me all , and fresh ideas for new programs.

Start the program A1 or CHMFINAL.

Following screen appears.

Choose from the menu

• PTOE

A part of periodic table appears on the LCD. You can view elements within their groups or search for a specific element by choosing FIND from the menu.

• FIND

Enter the first letter of the searched element. Alpha symbol blinks.

For example, you want to know more about calcium. Press letter C

All the elements (NO LANTHANIDE'S AND ACTINIDES) will appear in the menu. If there are then 5 elements "=>" symbol appears. Now, select Ca (F2) for calcium.

Explanation of the stuff on LCD. Ca - calcium symbol; Z - atomic number; Ar - atomic mass; In second row its electron configuration appears; E.N. - electron negativity, next to it is density; O.N.- shows oxidation numbers, m.p. - melting point; b.p. - boiling point, cry.str: - crystal structure, and finally Qu.No: are quantum numbers (Check with your teacher)

• EQUIL

To explain how does this program works, we'll use following reaction as a sample.

(1) H₂ (g) + (1) Cl₂ (g) <==> 2 HCl (g)        Kc = 0.100

*** IMPORTANT ***

*** When you have gaseous reactants and products and the number of moles of reactants equal the number of moles of reactants, then you can put moles instead concentrations ***
 

* coefficient in front of the " X " equals stehiometric coefficient of the specific compound

reactants have negative coefficient, product positive

This is a startup screen. First you enter the value of Kc (if it's unknown then enter 0). Then enter how many reactants and products you have. Limit for each of them is 3.

In first 3 rows is displayed formula by which TI calculates X. ...M of reactants means the initial molarity of specific reactant (see also ***), then enter coefficient of X for specific reactant (see also *). In the end you enter the name by which you want to call it.

This screen will be displayed the number of r e a c t a n t s times. In this case imputes are : 0.5 ; -1 ; H2 and 0.75 ; -1 and Cl2 respectfully

On this screen you can see your input. On the left are names you gave to reactants and products, in the middle are their molarity and on the right are their stehiometric coefficients (for more information see ***)

This screen pops after you press "ENTER". It's startup menu of OPERATNH program. Follow the menus to move around the program.

As an example, I'll use the part you will certainly use most. MISC menu. pH,  [OH-] and [H+] parts are easy to understand, but the " X " and Kc parts aren't.

• X part

" x==?" part will calculate the change of x, "chang" will change the signs of coefficients, "x-val" allows you to enter your own value of X and recalculates new value of Kc that will match that change. New value of Kc will appear on the screen.

 If you press "x==?" following screen will appear

Output screen. In the 1^st row are name of two reactants, in 2^nd are their initial molarities, in 3^rd are changes in molarity (depends on X-value), and in 4^th are final concentration of reactants. In the 5^th row are name of two products, in 6^th are their initial molarities, in 7^th are changes in molarity (depends on X-value), and in 8^th are final concentration of products.

If you press "Chang" the signs of stehiometric coefficients will change

	This message will appear
	This screen is displayed after you've entered values in equilibrium program (see above).
	This screen shows changes in stehiometric coefficient of reactants and products.It will appear on your calc. If you'd like to change them again, press chang button again. Notice, that value of your Kc remains the same.

By pressing "X-val"    

	Enter your value of X. Sometimes, the change in molarity that you're given in the test doesn't equal the value of X. It can be its MANIFOLD. Enter the value for 1 X. By knowing the coefficient you can calculate value of a single X
	New value of Kc will be displayed. It will match all stehiometric coefficients and concentrations of both reactants and products.

• Kc part

Sometimes, you need to correct the Kc value. Just enter new value.

The number you've entered isn't' saved into Kc until you confirm its new value. If your answer is NO, the value of Kc won't be changed

• SOLUB

Solubility part. List of all strong acids and base. Solubility tables for most common salts. Explanation of symbols used in tables. Follow the instructions on the screen.

• FORML

Use "Page+" and "Page-" to view formulas, and "Equat" part to visit redox equation data bank.