Elements, Compounds, and Mixtures

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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, salad, and sand.

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What is an element?

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An element is a pure substance that consists of only one type of atom. Examples include hydrogen (H), oxygen (O), and carbon (C).

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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. Examples include water (H2O) and carbon dioxide (CO2).

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What is the difference between a homogeneous mixture and a heterogeneous mixture?

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A homogeneous mixture has a uniform composition throughout (e.g., saltwater), while a heterogeneous mixture has a non-uniform composition (e.g., salad).

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What is an example of a homogeneous mixture?

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An example of a homogeneous mixture is steel, which is a mixture of iron and carbon.

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What is an example of a heterogeneous mixture?

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An example of a heterogeneous mixture is a bowl of cereal with milk, where the components can be easily distinguished.

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What is the chemical formula for glucose?

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The chemical formula for glucose is C6H12O6.

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What is the main component of air?

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The main component of air is nitrogen, which makes up about 78% of the Earth's atmosphere.

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What is the significance of the periodic table in understanding elements?

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

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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. Elements and compounds are pure substances.