Quick questions on Redox reactions and oxidation numbers in water: VCE Chemistry Unit 2

5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is oxidation numbers (rules)?

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The oxidation number (or oxidation state) is the hypothetical charge an atom would have if every bond were ionic. Use the rules in order; later rules yield to earlier ones if there is a conflict.

What is balancing half-equations in acidic solution?

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A half-equation is a balanced equation showing one half of the redox reaction with electrons explicitly. Use this procedure for acidic solution:

What is q1?

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Identify the oxidant, the reductant, and the oxidation state change for each element in:

\text{Zn} + \text{Cu}^{2+} \to \text{Zn}^{2+} + \text{Cu}

. [3 marks]

What is q2?

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Balance the half-equation for permanganate reduction in acidic solution:

\text{MnO}_4^- \to \text{Mn}^{2+}

. State the change in oxidation number. [3 marks]

What is q3?

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Iron(II) reacts with permanganate in acidic solution. (a) Write the balanced ionic equation. (b) Calculate moles of

\text{Fe}^{2+}

oxidised by

25.0 \, \text{mL}

0.0200 \, \text{mol/L}

\text{MnO}_4^-

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