Chemistry: Classification of Matter

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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 air.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture that does not have a uniform composition and consists of visibly different substances. An example is a salad.

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What is a physical property?

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A physical property is a characteristic of a substance that can be observed or measured without changing its identity. Examples include color, melting point, and density.

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What is a chemical property?

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A chemical property is a characteristic of a substance that can only be observed during a chemical reaction. Examples include flammability and reactivity.

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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. Examples include melting ice and dissolving sugar in water.

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. Examples include rusting iron and burning wood.

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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 substance formed when two or more elements are chemically bonded together. An example is water (H2O).

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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 and salad.

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How do you classify H2SO4?

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H2SO4 is classified as a compound because it is made up of two or more elements chemically combined.