# Examples of Common chemPad Notation

The following examples illustrate entry of some common notation.

Subject

Scenario

Type this

To display this

Molecules

Using subscripts to format molecular ratios in chemical formulas

H_2O

H2O

Simple Ions

Entering charges

Ca^2+

Ca2+

Molecular or Compound Ions

Entering charges and molecular ratios

SO_4^2-

SO42-

Complex Ions

Grouping with subscripts and superscripts

[Co(SCN)_2(H_2O)_4]^+

[Co(SCN)2(H2O)4]+

Isotope

Entering an isotopic mass number in the so-called M/A or M/Z format

^233_91Pa

Chemical Reactions

Entering a combination of correctly formatted chemical formulas and symbols

2 H_2O_2 --> 2 H_2O + O_2

2 H2O2   2 H2O + O2

Chemical Reactions with States of Matter

Entering a combination of correctly formatted chemical formulas with their respective states of matter and symbols

CH_4(g) + 4 S(s) -->

CS_2(l) + 2 H_2S(g)

CH4(g) + 4 S(s CS2(l) + 2 H2S(g)

Electron Configuration

Using complete notation

1s^2 2s^2 2p^5

1s2 2s2 2p5

Electron Configuration

Using noble gas notation

[He] 2s^2 2p^5

[He] 2s2 2p5

Equilibrium Expressions

Including a stacked fraction and multiplication dots

K_{c} = [COCl] * [Cl] /
[CO] * [Cl_2]

Electrochemical Cell Notation

Enter cell line notation.

Mg(s) | Mg^2+(aq) ||
Zn^2+(aq) | Zn(s)

Mg(s) | Mg2+(aq) || Zn2+(aq) | Zn(s)