Oxidation and Reduction Flashcards
1
Q
how does a metal become a metal ion ?
A
losing electrons with an increase in oxidation number to form positive ions
2
Q
how does a non metal become a non metal ion ?
A
gaining electrons with a decrease in oxidation number to form negative ions
3
Q
oxidation
A
gain of electrons
4
Q
reduction
A
loss of electrons
5
Q
examples of oxidation
A
burning
rusting ( conversion to form iron oxide )
6
Q
examples of reduction
A
metal oxides are reducing during the extraction of metals from their ores
7
Q
what is a redox reaction ?
A
a reaction involves oxidation and reduction
8
Q
Ca -> Ca2+ + 2e-
A
calcium is being oxidised as it is losing electrons
9
Q
1/2O2 + 2e- -> O2-
A
oxygen is being reduced as it is gaining electrons
