Click the following link to access the calculator, or highlight and paste in your Internet browser. The instructions follow.

http://www.ktf-split.hr/periodni/en/calc4chem.html

**Scientific calculator for chemists with
notebook**

Scientific calculator for chemists with notebook is a
fully functioning JavaScript calculator. This calculator can be used as common
scientific calculator (sin, cos, log, power, root, memory), but it also includes
a molecular weight calculator and the tables with various physical and chemical
constants. The calculator contains a list with task history, storing all the
recent inputs and results. Scientific calculator displays the numbers rounded to
a user-specified number of decimal places.

**Entering expression**

Type your expression directly onto the input line or copy and paste an expression from another programs. When you finish entering your expression, press

ENTERor click [=] button.

**Rules for typing expression**

- Spaces are irrelevant, for example 54 + 3*2 is equal 54+3*2
- If you press a function button without argument, the last result becomes a function argument
- If the first character in the expression is a math operator (+, *, /) then the last result is put in before the math operator

**Angle measure**

In trigonometric calculations, angles are interpreted as radians (default) or degrees, depending on mode setting (Deg or Rad mode).

**Number formats**

Results can be rounded to a user-specified number of decimal places (max 15-digit). This calculator can round mantissa under scientific notation, also. For example, numbers rounded to a 4 digit like this: decimal number 3.5269, integer number 35269.0000 and scientific number 3.5269 e-31.

**Arithmetic operators**

To perform basic mathematical operations use the following arithmetic operators: addition (

+), subtraction / minus sign (-), multiplication (*) and division (/)

**Positive numbers**

Enter a positive number by pressing the appropriate digit keys (or buttons) and, if necessary, the decimal point key [

.]. Period and comas are equivalents as decimal separator in numbers (3,2 + 4.3 = 7.5).

**Negative numbers**

Negative numbers are obtained by simple putting the minus sign (

-) before the number.

**Scientific notation**

Use standard calculator notation for scientific notation, for example 1e-5 is 0.00001; 1e+3 or 1e3 is 1000. Enter the mantissa as the positive or negative number, and then click [

E] button or just type lowereand type exponent as the positive or negative number.

**Parentheses**

Operations with the same precedence are performed from left to right, with operations enclosed in parentheses performed first. If parentheses are nested, the operations enclosed in the innermost set of parentheses are performed first. All types of parentheses are correct, for example 25.3/(K3[Fe(CN)6]).

**Chemical formulae**

- The element symbols in chemical formula must be properly capitalized.
- For indicating hydration you must use a
**+**sign (CuSO4+5*H2O). - It is correct to type the leading number before formula without parentheses: 3*CO2 is equal 3*(CO2)

**Physical constants**

Clicking the

Constantsbutton expand of Scientific calculator for chemists you get access physical constants table. Click the button near constant that you want to insert into expression.

**Examples:**

2+5-3.25 = 3.75

+5 = 8.75

8+7+(42-16)*3 = 93

8+7+[(42-16)-7]*3 = 72

5*-7 = -35

7e-6/3e-9 = 2333.3333333333

H2SO4 = H*2+S+O*4 = 1.00794*2+32.066+15.9994*4 = 98.079