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GCSE Chemistry · key term
Analysis that identifies which substances or ions are present, rather than measuring how much is present.
Used by AQA, Edexcel and OCR
Specification 4.8.3.6 · Paper 2
Analysis that establishes which substance or substances are present.
Revise: Instrumental AnalysisFinding the identity of a substance is qualitative analysis: it answers “What is present?” Some instrumental methods can also perform quantitative analysis, answering “How much is present?” by measuring a quantity such as concentration.
Specification 9.1C, 9.6C, 9.7C · Paper 2
The identification of substances from their chemical or physical properties, without measuring how much is present.
Revise: Uniqueness of TestsIn qualitative analysis, the aim is to find out which substances are present. When testing for an ion, a chemist carries out a specified procedure and observes what happens. The observation might be a particular colour, the formation of a precipitate or the production of a gas.
A test used to find which substances or ions are present, rather than how much is present.
The use of observations from chemical tests to determine which substances or ions are present.
Specification C4.2b, PAG 2, PAG 5 · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The identification of substances from characteristic reactions and observations rather than by measuring how much is present.
Analysis used to identify which substances or ions are present from their observable chemical behaviour, rather than measuring how much is present.
Analysis that identifies substances from observations, rather than measuring how much is present.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Analysis that identifies which substances or components are present, rather than measuring how much of each is present.
Revise: SamplingIn qualitative analysis, the question is which substances are present? The answer is useful only if the sample gives a fair indication of the material the chemist wants to investigate.
Finding out which substances or ions are present in a sample, rather than how much of each is present.
The investigation of a sample to identify the substance or substances present.
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