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Redox

Oxidation and reduction - definitions

QuestionAnswer
Modern definition of redox Transfer of electrons (Reduction + Oxidation)
What is oxidation? Loss of electrons
What is reduction? Gain of electrons
Early definition of oxidation? Combining with oxygen
What does OILRIG stand for? Oxidation Is Loss Reduction is Gain
What does an oxidising agent do? `It oxidises something else and is itself reduced
Chose the correct word: An oxidising agent is an electron acceptor/donor Acceptor (has to be reduced itself)
Chose the correct word: A reducing agent is an electron acceptor/donor Donor (the thing that is oxidised)
What is the guide to development of redox? Electronegativity
What is the oxidation state of any element and why? 0 (zero). Because oxidation states refer to atoms in compounds.
What does oxidation state or number refer to? The number of electrons lost, gained or shared by an atom in a compound
Oxidation state = ? charge on ion (as this is the number of electrons lost or gained)
What is the name of elements that nearly always have the same oxidation state in their compounds? Fixed oxidation state
What is the fixed oxidation state of elements in group 1? +1
What is the fixed oxidation state of elements in group 2? +2
What is the fixed oxidation state of Fluorine? -1
What are charged compounds called? Compound ions
Define Oxidation Oxidation is an increase in oxidation state (more positive or less negative)
Define Reduction Reduction is a decrease in oxidation state (less positive or more negative)
Summarise in three points oxidation. Gain of oxygen, loss of electrons, increase in oxidation number
Summarise in three points reduction Loss of oxygen, gain of electrons, decrease in oxidation number
Is the oxidation state calculated per compound or atom? Per atom
Created by: saltpopcorn
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