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SingaporeChemistryQuick questions
Energetics, Rates of Reaction and Redox
Quick questions on Redox and oxidation states explained: O-Level Chemistry
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 redox reactions happen together?Show answer
Oxidation and reduction always occur together in a redox reaction: if one substance loses electrons (is oxidised), another must gain them (is reduced). You cannot have one without the other, because the electrons lost by one species are the electrons gained by another.
What are colour-change tests?Show answer
Two coloured reagents are used to test for redox behaviour:
What is q1?Show answer
Define oxidation in terms of electrons. [1 mark]
What is q2?Show answer
In the reaction where hydrogen reduces copper(II) oxide to copper, state which substance is the reducing agent. [1 mark]
What is q3?Show answer
State the colour change of acidified potassium manganate(VII) when added to a reducing agent, and what it indicates. [2 marks]
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