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Classification and Changes of Matter

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Created November 18, 2025

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UNIT 1 — Classification of Matter & Changes in Matter 1.1 Substances vs. Mixtures

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Substances: Pure matter with fixed composition. Elements (e.g., O₂,

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Au) – made of only one type of atom. Compounds (e.g., H₂O, CO₂) – chemically

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combined elements in fixed ratios. Mixtures: Physical blends of substances; composition varies.

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Homogeneous: uniform (saltwater, air). Heterogeneous: non-uniform (sand+water).

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1.2 Elements, Compounds, Atoms – Subtypes Elements: Monatomic: He,

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Ne, Ar Diatomic: H₂, N₂, O₂,

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F₂, Cl₂, Br₂, I₂ Compounds:

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