Classification of Matter

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What is a pure substance?

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A pure substance is a material that has a constant composition and consistent properties throughout. Examples include elements and compounds.

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What is a mixture?

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A mixture is a combination of two or more substances where each retains its own properties. Mixtures can be homogeneous or heterogeneous.

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What is the difference between a homogeneous mixture and a heterogeneous mixture?

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A homogeneous mixture has a uniform composition throughout (e.g., saltwater), while a heterogeneous mixture has a non-uniform composition (e.g., fruit salad).

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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 hydrogen (H) and oxygen (O).

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What is a compound?

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A compound is a pure substance formed when two or more elements chemically combine in fixed proportions. Examples include water (H2O) and carbon dioxide (CO2).

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What is a particle diagram?

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A particle diagram visually represents the arrangement and behavior of particles in a substance, helping to classify it as an element, compound, or mixture.

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How would you classify brass (Cu and Zn)?

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Brass is classified as a mixture because it consists of two different metals, copper (Cu) and zinc (Zn), that retain their individual properties.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture that has a uniform composition and appearance throughout, such as air or vinegar.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture that consists of visibly different substances or phases, such as a salad or a bowl of cereal.

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What is the classification of a mixture of elements?

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A mixture of elements is classified as a heterogeneous mixture if the elements are not uniformly distributed.