§-Quick questions
QLDChemistryUnit 3: Equilibrium, acids and redox reactions
Quick questions on Oxidation numbers and half-equations (QCE Chemistry Unit 3)
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 are constructing half-equations?Show answer
A half-equation shows either the oxidation or the reduction half of a redox reaction. The protocol for aqueous solution:
What is half-equations in basic solution?Show answer
When QCAA states the reaction occurs in basic conditions, do the acidic-conditions protocol first, then add OH- to both sides to neutralise the H+, and simplify the resulting H2O on each side.
What is q1?Show answer
Assign oxidation numbers to all elements in (a) , (b) , (c) . [3 marks]
What is q2?Show answer
Balance the half-equation in acidic solution. [3 marks]
What is q3?Show answer
Combine half-equations for /Mn and / in acid. (a) Write both. (b) Combine into a balanced overall equation.
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