Nature And Classification Of Matter

Student can classify matter by state and composition.

5 lessons

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Concept

States of Matter

Define solid, liquid, and gas based on particle arrangement.

Everything around you that has mass and occupies space is called matter. In our daily lives, we interact with matter in three primary physical states: solid, liquid, and gas. The state of a substance depends on how closely its constituent particles are held together and how much freedom they have to move.

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Content

Macroscopic Classification

Distinguish pure substances and mixtures.

When we look at matter at a bulk (macroscopic) level, we can classify it into two broad categories based on its composition: Mixtures and Pure Substances.

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Elements vs. Compounds vs Mixtures

Matrix comparing properties of elements, compounds, and mixtures.

Elements

One type of atom

Pure

Atom type: Exactly one type of atom (e.g., Na, Cu, H₂).
Breakdown: Cannot be broken down by ordinary chemical processes.
Form: May exist as individual atoms or molecules.

Compounds

Fixed ratio

Chemical

Made of: Two or more elements chemically combined in a fixed, definite ratio.
Separation: Constituents cannot be separated by physical methods; chemical reactions are needed.
Properties: Entirely different from constituent elements, e.g., H₂O puts out fires, unlike explosive H₂.

Mixtures

Variable ratio

Physical

Made of: Two or more pure substances physically mixed in any variable ratio.
Properties: Components retain their original individual chemical properties.
Separation: Can be separated by physical methods like filtration, evaporation, or hand-picking.

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Practice

Classify the Substance

Identify whether a given sample is a mixture or pure substance.

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A scientist is working with a cylinder of pure oxygen gas (O₂). Every molecule in the cylinder consists of exactly two identical oxygen atoms bonded together. How should this substance be classified?

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