Redox Reactions Flashcards
What is oxidation?
A loss of electrons.
What happens to the oxidation state of a substance when it’s reduced?
The oxidation state will decrease.
During a redox reaction, an oxidising agent _____ electrons and is _____.
During a redox reaction, an oxidising agent gains electrons and is reduced.
What is a reducing agent?
A substance that is oxidised. It donates electrons.
What is reduction?
A gain of electrons.
What happens to the oxidation state of a substance when it’s oxidised?
The oxidation state will increase.
During a redox reaction, a reducing agent ____ electrons and is ______.
During a redox reaction, an oxidising agent loses electrons and is oxidised.
What is an oxidising agent?
A substance that is reduced. It accepts electrons.
The equation below shows the reaction of chlorine gas with iron(II) ions in solution:
Cl₂(g) + 2Fe²⁺(aq) → 2Cl⁻(aq) + 2Fe³⁺(aq)
Write a half-equation to show the conversion of chlorine, Cl₂, into chloride ions Cl⁻.
[1 mark]
Cl₂ + 2e⁻ → 2Cl⁻
The equation below shows the reaction of chlorine gas with iron(II) ions in solution:
Cl₂(g) + 2Fe²⁺(aq) → 2Cl⁻(aq) + 2Fe³⁺(aq)
Write a half-equation to show the conversion of iron(II) ions, Fe²⁺, into iron(III) ions, Fe³⁺.
[1 mark]
Fe²⁺ → Fe³⁺ + e⁻
The equation below shows the reaction of chlorine gas with iron(II) ions in solution:
Cl₂(g) + 2Fe²⁺(aq) → 2Cl⁻(aq) + 2Fe³⁺(aq)
In this reaction, which species is the reducing agent? Explain your answer.
[2 marks]
- Iron(II) ions/Fe²⁺,…
- …because during the reaction they donate electrons/ are oxidised.
Use oxidation states to balance this redox reaction:
Ca(s) + Al³⁺(aq) → Ca²⁺(aq) + Al(s)
[1 mark]
3Ca(s) + 2Al³⁺(aq) → 3Ca²⁺(aq) + 2Al(s)
