HOW TO USE CALCULATOR

Calculator for Chemists

 


Previuos: Toolbar Contents Next: Basic calculations

3.1. Entering expression

Type your expression into the calculator just as you talks. Examples are available from Help menu (see Example tasks). Click on an example in the task history to see its calculation.

There are four ways to insert an expression onto the input line:

To edit an existing expression, go on the input line, use the mouse or the arrow keys to position the cursor where you want to insert the character, function or constant, and enter that.

When you finish entering your expression, press ENTER or click = button.

Positive numbers
Enter a positive number by pressing the appropriate digit keys and, if necessary, the decimal point key [.] or decimal comma key [,]. Calculator for Chemists will automatic change comas and dots to the selected decimal separator in the Format menu (3,14 = 3.14).
Negative numbers
Negative numbers are obtained by simple putting the minus character (-) before the number (-2*-3 = 6).
Mantissa and exponents
Enter the mantissa as the positive or negative number, and then click the E button or just type E or e and type the exponent as the positive or negative number (-3.21e-6).
Functions
Every function that is supported by Calculator for Chemists can be inserted by clicking on the button with the function name or by typing its name on the physical keyboard. All supported functions are not assigned on buttons. To view the complete list of the function, go to Insert menu.
Function arguments do not have to be put in brackets, unless if they are defined as mathematical expressions (cospi or log1000).
Chemical formulae
The element symbols can be written in lowercase letters with the number of atoms after symbol, and the program will translate them. If the elements in a chemical formula are properly capitalized, the smart case converter leaves them as you have typed.. For indicating hydration you must use a + sign and a leading number before the formula is correct (CuSO4+5H2O).
Constants
Select a constant from Insert menu and click the constant which you want to insert into the expression.
Power
Enter the number as the positive or negative number, and then click ^ button or just type ^ or ** and type power as the positive or negative number (3**3 = 3^3 = 27).
Root
Enter the root as the positive or negative number, and then click the _ button or just type _ and type the number as the positive number (3_125 = 5).
The root is obtained by raising the number to the reciprocal value of the root (1/x); for example, third root of 8 is 8^(1/3)=2 or 3_8=2.

Enter data from the history

You can also enter data onto the input line from history:

  1. Press button to display the task history.
  2. Scroll the list until the data you want to copy to the input line is visible.
  3. Click the left button of the mouse

Rules for typing expression

There are a few rules for typing expression into the Calculator for Chemists:

Smart case conversion

The element symbols can be written in lowercase letters, and the intelligent routine in the program will try to translate them and will show the result of translation - or it will report an error. If the elements in a chemical formula are properly capitalized, the smart case converter leaves them as you have typed.

The appearance of mathematical expression, which is the result of the translation, can be seen if the mouse pointer is held over the tasks field.

Implied multiplication

When you enter an expression, you press * button or * key to specify multiplication. For certain expressions, Calculator for Chemists assumes that multiplication is intended and you do not need to specify it. This is the case in the following situations:

 

 


Previuos: Toolbar Contents Next: Basic calculations

 

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