Classification of Matter

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded. Examples include air, salad, and sand.

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What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include oxygen, hydrogen, and gold.

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What is a compound?

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A compound is a substance formed when two or more elements are chemically bonded together. Examples include water (H2O) and carbon dioxide (CO2).

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture that has a uniform composition throughout. Examples include saltwater and vinegar.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture where the components are not uniformly distributed. Examples include salad and oil and water.

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What is a suspension?

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A suspension is a heterogeneous mixture in which solid particles are dispersed in a liquid but will settle over time. Example: muddy water.

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What is a colloid?

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A colloid is a mixture where very small particles of one substance are evenly distributed throughout another substance. Example: milk.

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What is the difference between a pure substance and a mixture?

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A pure substance has a constant composition and distinct properties, while a mixture contains two or more substances that retain their individual properties.

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What is the significance of the periodic table?

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The periodic table organizes all known elements based on their atomic number, electron configuration, and recurring chemical properties.

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What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.