Page 9 - E-Science Prep3 2024-2025 t1 Unit2_Neat

Science department
Prep.3

Oxidation Reduction

Chemical process causes the Chemical process causes the
increase in O % (gains O) decrease in O % (loses / gives O)

/ decrease H % (loses / gives H) / increase H % (gains H)

Chemical process where the atom Chemical process where the atom
loses electron(s) gains electron(s)

Reducing agent (Most metals) Oxidizing agent (Most non-metals)

Substance takes O away / gives H Substance gives O / takes H away

Substance loses electron(s) Substance gains electron(s)

Cu Cu+2 + 2é Br + é Br-
Ag+ + é Ag
F- F+é

Concurrent processes

(The number of gained é in reduction = The number of lost é in oxidation)

Mg + 2HCl MgCl2 + H2

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Second Term
Term