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In Course: GCSE Combined Science (AQA Trilogy): Chemistry

AQA GCSE Combined Science: Chemical Analysis

Covers the techniques used to identify substances. This deck defines pure substances and formulations. It details the method of paper chromatography, including the calculation of Rf values. It also provides the chemical tests required to identify hydrogen, oxygen, carbon dioxide, and chlorine gases. Finally, it covers the flame tests and precipitate tests used to identify specific metal ions, and the tests for carbonate, halide, and sulfate ions. This deck includes Required Practical 5 (Paper Chromatography).

A dramatic macro photograph capturing the vivid separation of a dark ink spot into distinct, vibrant bands of color on chromatography paper. The solvent front is visible, and the colors fan out beautifully across the paper's fibrous texture, under bright, focused studio lighting.

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Deck Contents

51 Cards
Lesson#1
In this deck, you'll learn about chemical analysis, which is how chemists identify unknown substances. We'll start by defining what a 'pure' substance really means in chemistry. Then, we'll explore a powerful separation technique called paper chromatography, which is a required practical. Finally, you'll learn the specific chemical tests used to identify common gases, metal ions, and negative ions – essential knowledge for your GCSE exams.
Lesson#2
In everyday language, 'pure' might mean something natural, like pure orange juice. But in chemistry, the definition is much stricter. A pure substance consists of only one element or one compound. For example, pure water contains only water molecules, H two O. Pure copper contains only copper atoms. Anything else is a mixture.
Quiz#3
In chemistry, what is a pure substance?

A single element or compound

Lesson#4
Most products we use are not pure substances, but carefully designed mixtures called formulations. A formulation is a mixture that has been designed as a useful product. The components are mixed in carefully measured quantities to ensure the product has the required properties. Examples include fuels, cleaning agents, paints, medicines, and even food products.
Quiz#5
In chemistry, what is the term for a complex mixture designed as a useful product, like paint or medicine?

A formulation

Lesson#6
Imagine you have a pen with black ink, but you suspect it's actually a mixture of different coloured dyes. How could you separate them? You'd use a technique called chromatography. Chromatography is a method used to separate a mixture into its different components. In paper chromatography, we use a special paper and a solvent to separate substances based on how soluble they are.

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