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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 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, oxygen, 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 chemically bond together in fixed proportions. Examples include water (H2O) and carbon dioxide (CO2).

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What is an atom?

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An atom is the smallest unit of matter that retains the properties of an element. It consists of protons, neutrons, and electrons.

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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. Examples include saltwater and air.

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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, and different parts can be seen. Examples include salad and sand.

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What is the difference between a compound and a mixture?

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A compound is a chemical combination of elements, while a mixture is a physical combination of substances that can be separated by physical means.

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What is the building block of matter?

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The building block of matter is the atom.

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What is the chemical symbol for oxygen?

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The chemical symbol for oxygen is O.