Pure Substances vs. Mixtures

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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. It can be an element or a compound.

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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 and can be separated by physical means. Mixtures can be homogeneous or heterogeneous.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture in which the components are uniformly distributed and the composition is the same throughout, such as saltwater.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture in which the components are not uniformly distributed, and different parts can be seen, such as a salad.

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Can a pure substance be made from multiple elements?

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Yes, a pure substance can be made from multiple elements that are chemically combined, such as water (H2O), which is a compound.

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What is an example of a pure substance?

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An example of a pure substance is mercury (Hg), which is a chemical element.

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What is an example of a mixture?

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An example of a mixture is Dr. Pepper, which contains various ingredients that are not chemically combined.

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What defines an isotope?

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An isotope is a variant of a chemical element that has the same number of protons but a different number of neutrons.

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Why is carbon (C) considered a pure substance?

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Carbon (C) is considered a pure substance because all its atoms have the same number of protons and similar properties.

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What is the difference between a compound and a mixture?

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A compound is a pure substance formed when two or more elements are chemically bonded, while a mixture is a combination of substances that are not chemically bonded.