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Can someone please give me an overview on the topic of redox reactions for IGCSE...

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john123987 | Student, Undergraduate | Honors

Posted January 24, 2012 at 1:04 AM via web

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Can someone please give me an overview on the topic of redox reactions for IGCSE Chemistry?

Giving me a few of the equations involved during these processes (as well as the electron transfer equations) would be very helpful. Thank you in advance.

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bandmanjoe | Middle School Teacher | (Level 1) Senior Educator

Posted January 24, 2012 at 2:52 AM (Answer #1)

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Redox (shorthand for oxidation-reduction) reactions describe all chemical reactions in which atoms have their oxidation number (oxidation state) changed.  This can be a simple redox process, such as the combustion of carbon with oxygen to produce carbon dioxide (CO2), the reduction of carbon by hydrogen to produce methane (CH4), or a complex process such as the use of glucose (C6H12O6) in cellular respiration in animal cells to produce energy.

Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion.

Reduction is the gain of electrons or a decrease in oxidation state by a molecule, atom, or ion.

Here is one of the simple reactions described above:

C  +  O2--->  C (+4)  +  O (-2) O (-2) --->  CO2

Carbon is oxidized, by giving up electrons to the oxygen, which is reduced by gaining the electrons.

Sources:

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michaelthenew | Student, Grade 10 | eNoter

Posted July 11, 2013 at 7:40 AM (Answer #2)

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redox is word which is formed from two words, which are reduction and oxidation.reduction is the gaining of electrons and oxidation is the losing of electrons. In other terms is reduction is the losing of oxygen atoms and oxidation is the gaining of the oygen atoms.

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