Review of 8.6A (Elements, mixtures, and compounds)

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture in which the composition is uniform throughout. Examples include saltwater and air.

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What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture in which the composition is not uniform throughout. Examples include salad and sand.

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What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together. Examples include water (H2O) and carbon dioxide (CO2).

Front

What is an element?

Back

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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How can mixtures be classified?

Back

Mixtures can be classified as homogeneous or heterogeneous based on the uniformity of their composition.

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What is the difference between a mixture and a compound?

Back

A mixture is a physical combination of substances that can be separated, while a compound is a chemical combination of elements that cannot be separated by physical means.

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What does it mean for a mixture to have different proportions of components?

Back

It means that the amounts of the substances in the mixture can vary, unlike in a compound where the ratio of elements is fixed.

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Can an element exist in different forms?

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Yes, elements can exist in different forms called allotropes. For example, carbon can exist as graphite or diamond.

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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.

Front

What is the significance of the periodic table?

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The periodic table organizes all known elements based on their atomic number, electron configuration, and recurring chemical properties.