Redox Reactions

Front

What are half-reactions in redox reactions?

Back

Half-reactions are equations that show either the oxidation or reduction process separately, representing the transfer of electrons.

Front

What does the half-reaction Cl₂ + 2e^- → 2Cl^- represent?

Back

This half-reaction represents a reduction process where chlorine gas gains electrons to form chloride ions.

Front

What is the definition of oxidation in the context of redox reactions?

Back

Oxidation is the process in which an atom, ion, or molecule loses electrons.

Front

What is the definition of reduction in the context of redox reactions?

Back

Reduction is the process in which an atom, ion, or molecule gains electrons.

Front

Identify the oxidized element in the reaction Zn + H₂O → ZnO₂ + H₂.

Back

Zinc is the oxidized element in this reaction.

Front

What is the oxidation state of aluminum in Al₂O₃?

Back

In Al₂O₃, the oxidation state of aluminum is +3.

Front

Write the half-reaction that represents the oxidation of aluminum in the corrosion of aluminum.

Back

The half-reaction is Al → Al³⁺ + 3e^-.

Front

What is the role of electrons in redox reactions?

Back

Electrons are transferred between species, with one species being oxidized (losing electrons) and the other being reduced (gaining electrons).

Front

What is a common example of a redox reaction in everyday life?

Back

A common example is the rusting of iron, where iron oxidizes in the presence of oxygen and moisture.

Front

How can you identify a reduction half-reaction?

Back

A reduction half-reaction can be identified by the gain of electrons and a decrease in oxidation state.