BRAINCAKEExam-style Question 3
Question (3 marks): In acidic solution, dichromate(VI) ions are reduced to chromium(III) ions. Construct the ionic half-equation for this change.
Step 1: balance the element that changes. There are two chromium atoms on the left, so put 2 in front of Cr3+:
Cr2O72− → 2 Cr3+
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Key terms in this lesson
- half-equation
- An equation showing only the electrons lost or gained by one species in a redox reaction.
- oxidising agent
- A substance that accepts electrons from another species, causing it to be oxidised, while it is itself reduced.
More in Oxidation and Reduction
- Example Question 1
- Example Question 2
- Ionic Equations
- Exam-style Question 1
- Exam-style Question 2
- Exam-style Question 4
- Exam-style Question 5
- Exam-style Question 6
All 14 lessons in Oxidation and Reduction · All Edexcel AS-level Chemistry topics