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AS 1 Basic Concepts in Physical and Inorganic Chemistry

Quick questions on Redox chemistry: oxidation numbers, half-equations and balancing - CCEA A-Level Chemistry

3short 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 not cancelling electrons when combining half-equations?
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Scale the half-equations so the electrons match, then they cancel.
What is q1?
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State the oxidation number of nitrogen in NO3−\text{NO}_3^-. [1 mark]
What is q2?
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In the reaction Zn+Cu2+→Zn2++Cu\text{Zn} + \text{Cu}^{2+} \rightarrow \text{Zn}^{2+} + \text{Cu}, identify the reducing agent. [1 mark]

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