Alevel > topic 3 > Flashcards

topic 3 Flashcards

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1
Q

oxidation numbers

A

a number assigned to a combined element that represents the number of electrons transferred compared to the element in its standard state

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2
Q

oxidation

A

loss of e
increase in O.N
gain of oxygen
loss of hydrogen

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3
Q

reduction

A

gain in e
decrease in O.N
loss of oxygen
gain of hydrogen

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4
Q

redox

A

both reduction and oxidation simultaneously

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5
Q

disproportionation

A

simultaneous oxidation and reduction of an element in a single species

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6
Q

complex half equation Cr2O72-

A 
Cr2O72-  --->  Cr3+
Cr2O72-   --->  2Cr3+
Cr2O72-   --->  2Cr3+ + 7H2O
Cr2O72-   --->  2Cr3+  +  7H2O
Cr2O72-   --->  2Cr3+  +   7H2O
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6
Q

complex half equation Cr2O72-

A 
Cr2O72-  --->  Cr3+
Cr2O72-   --->  2Cr3+
Cr2O72-   --->  2Cr3+ + 7H2O
Cr2O72-   --->  2Cr3+  +  7H2O
Cr2O72-   --->  2Cr3+  +   7H2O
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