S INGLE B OND P RACTICE 1

Oxidation number formula

To calculate oxidation numbers of elements in the chemical compound, enter it's formula and click 'Calculate' (for example: Ca2+, HF2^-, Fe4[Fe(CN)6]3, NH4NO3, so42-, ch3cooh).

Rules for assigning oxidation numbers

  • The oxidation number of a free element is always 0.
  • The oxidation number of a monatomic ion equals the charge of the ion.
  • Fluorine in compounds is always assigned an oxidation number of -1.
  • The alkali metals (group I) always have an oxidation number of +1.
  • The alkaline earth metals (group II) are always assigned an oxidation number of +2.
  • Oxygen almost always has an oxidation number of -2, except in H2O2 (when it is -1) and in OF2 (when it is +2).
  • Hydrogen has an oxidation number of +1 when combined with non-metals, but it has an oxidation number of -1 when combined with metals.
  • The algebraic sum of the oxidation numbers of elements in a compound is zero.
  • The algebraic sum of the oxidation states in an ion is equal to the charge on the ion.

Assigning oxidation numbers to organic compounds

  • The oxidation state of any chemically bonded carbon may be assigned by adding -1 for each more electropositive atom and +1 for each more electronegative atom, and 0 for each carbon atom bonded directly to the carbon of interest.

Portable applications

is a small but powerful scientific expression calculator which supports many scientific functions (sin, cos, log, power, root, memory...), normal and inverse. All of the calculations can be printed or saved and recalled again. is a useful tool which allows you to calculate how many solid chemicals or stock solutions you will need to prepare the desired solution. The program provides lab-ready directions on how to prepare the desired solution. helps you convert measurements from one unit of measurement to another (you can create your own custom units). It also includes the ability to convert the number from one numeral system into another (e.g. from binary into hexadecimal or Roman numeral system).
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