Chemistry: Classification of Matter

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What is a heterogeneous mixture?

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A heterogeneous mixture is a combination of two or more substances that are not uniformly distributed, meaning the different components can be seen and separated. Example: Soil.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture in which the composition is uniform throughout, and the different components are not distinguishable. Example: Milk.

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What is matter?

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Matter is anything that has mass and occupies space. It includes solids, liquids, gases, and plasma.

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What is not considered matter?

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Gravity is not considered matter because it does not have mass or occupy space.

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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 substance retains its own properties. Mixtures can be homogeneous or heterogeneous.

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What is a chemical change?

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A chemical change is a process that involves the transformation of one or more substances into different substances, often accompanied by energy changes. Example: Rusting of iron.

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Example: Melting ice.

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What are the two main types of mixtures?

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The two main types of mixtures are homogeneous mixtures and heterogeneous mixtures.

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What is an example of a heterogeneous mixture?

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An example of a heterogeneous mixture is salad, where the individual ingredients can be seen and separated.