Chemistry A-Level
no colour change
What no colour change means in Chemistry A-Level, as defined for AQA.
Definition of no colour change
Check what you remember
Read the wording for your board, then hide it and explain no colour change in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
The mixture stays orange because the dichromate is not reduced to chromium(III), and that negative result is itself a useful test.
Topics that use no colour change
- Oxidation of alcohols (AQA A-Level)
Related terms
- acidified potassium dichromate(VI)
- carbon–carbon bond too strong
- distillation against reflux
- hydrogen on the carbonyl carbon
- ketone product
- no hydrogen on the hydroxyl carbon
- secondary alcohol oxidation
- tertiary alcohols
Using no colour change in the exam
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