Chapter 5: Oxidation and Reduction Flashcards
Everyday examples of redox reactions
browning of apples, respiration and photosynthesis
Define oxidation in terms of electrons
Oxidation is the loss of electrons
Define reduction in terms of electrons
Reduction is the gain of electrons
Define oxidising agent
An oxidising agent is a substance that allows oxidation to happen by gaining electrons itself. An oxidising agent is always reduced.
Oxidising agents x4
Oxygen
Potassium manganate(VII)
HOCl
Hydrogen peroxide
Define reducing agent
A reducing agent is a substance that allows reduction to happen by losing electrons itself. A reducing agent is always oxidised
Reducing agents x4
Sulfur dioxide
Carbon
Carbon monoxide
Hydrogen
Oxygen use oxidation
Combustion, respiration
Potassium manganate(VII) use oxidation
Titrations, organic preparations
HOCl use oxidation
Kills microorganisms by oxidising them
Hydrogen peroxide use oxidation
Stain removal, bleaching of hair
Sulfur dioxide use reducing
Bleaching agent
Carbon and carbon monoxide use reducing
Production of metals from ore
Hydrogen use reducing
Reduction of organic compounds
Define oxidation number
The oxidation number of an atom is the charge that the atoms appears to have when the electrons are distributed according to certain rules
Define oxidation in terms of oxidation number
Oxidation is an increase in oxidation number
Define reduction in terms of oxidation number
Reduction is a decrease in oxidation number
Define electrolyte
An electrolyte is a substance that conducts electricity when dissolved in water or when molten
Define electrolysis
Electrolysis is the breakup of a substance due to the passage of an electric current through it in aqueous solution or when molten
Oxidation occurs at the …
Anode
Reduction occurs at the …
Cathode
