Matter & Its PropertiesHESI A2 cheat sheet

Physical, chemical, pure, mixed

8 key facts 5 practice questions Reviewed Oct 2026

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Classifying

Pure substance — element or compound, fixed composition
Mixture — two or more substances, separable physically
Homogeneous mixture = solution; heterogeneous = visibly distinct

Properties

Physical — observed without changing identity (color, density, boiling point)
Chemical — how it reacts (flammability, reactivity)

Changes

Physical change — identity stays (melting, dissolving)
Chemical change — new substance forms (rusting, burning)

Clues To A Chemical Change

Gas produced, precipitate forms, color change, heat or light released

Key takeaway

Physical, chemical, pure, mixed

Before you read

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Question 1 of 5

Which of these is a physical property of a substance?

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