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Purity & Formulations

Revise Purity & Formulations in Chemical Analysis for GCSE Chemistry with 20 exam-style questions and 12 flashcards. This topic appears regularly enough that it should be part of a solid GCSE revision cycle.

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The Purity Paradox

Introduction 2

What Makes a Substance Pure?

Deep Dive 3

Melting and Boiling Points as Purity Tests

Deep Dive 4

How Impurities Shift the Points

Diagram 5

Why Impurities Affect Melting Points

How It Works 6

Key Definitions

Definitions 7

Formulations

Key Facts 8

Pure vs Impure: Everyday Examples

Comparison 9

Common Misconceptions

Misconceptions 10

Memory Aid

Memory Aid 11

Exam Focus

Exam Focus 12

Exam Tips for Purity and Formulations

Exam Tips 13

Topic Summary: Purity and Formulations

Summary

Sample Flashcards

What is a formulation?

A mixture designed to have specific properties for a particular purpose, with each component in measured quantities

Give 3 examples of formulations

1) Paint (pigment + binder + solvent), 2) Medicine tablets (active ingredient + binder + filler), 3) Petrol (hydrocarbons + octane improvers + additives)

Sample Questions

In chemistry, what does it mean for a substance to be described as 'pure'?

A. It contains only one type of element or compound
B. It has been filtered to remove large particles
C. It has no colour or smell
D. It is safe to drink or eat

1 markfoundation

Explain why the presence of impurities in a substance lowers its melting point and causes it to melt over a range of temperatures.

3 marksstandard

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