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Edexcel A-Level Chemistry AS 8.10 Write Ionic Half Equations and Use Them to Construct Full Ionic Equations 8b the Elements of Groups 1 And 2 Students Will Questions

Balance non-hydrogen atoms first, use H₂O and H⁺ where appropriate, add electrons to balance charge and scale both halves so every electron cancels.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Balance acidic half-equations with H₂O, H⁺ and electrons in the correct positions.
  • Scale and combine half-equations so electrons cancel and atoms and charge remain balanced.
  • Write overall ionic equations with correct species, coefficients and state symbols when required.

Edexcel A-Level Chemistry AS 8.10 Write Ionic Half Equations and Use Them to Construct Full Ionic Equations 8b the Elements of Groups 1 And 2 Students Will Questions question 1

[Maximum number: 2]

This is a question about alcohols.

Ethanol can be oxidised by acidified sodium dichromate(VI) to ethanal and then to ethanoic acid. The apparatus may be set up in two ways.

Figure for Question Edexcel A-Level Chemistry AS 8.10 Write Ionic Half Equations and Use Them to Construct Full Ionic Equations 8b the Elements of Groups 1 And 2 Students Will Questions question 1 — Edexcel A-Level Chemistry AS

Complete the ionic half-equation for the reduction of the dichromate(VI) ions to chromium(III) ions.
State symbols are not required.

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