Elements, Compounds, Mixtures

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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 gold (Au).

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What is a compound?

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

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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 (a mixture of gases) and salad (a mixture of various ingredients).

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How can you classify brass?

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Brass is classified as a mixture because it is formed by combining two elements, zinc and copper, without a chemical reaction.

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What is the difference between a compound and a mixture?

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A compound is made of two or more elements chemically bonded together, while a mixture consists of two or more substances that are not chemically bonded.

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What does a particle diagram represent?

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A particle diagram visually represents the arrangement and types of particles in a substance, helping to illustrate whether it is an element, compound, or mixture.

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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, such as saltwater or 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, such as a salad or a mixture of sand and iron filings.

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What is the chemical formula for ammonia?

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The chemical formula for ammonia is NH3.

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What is the chemical formula for water?

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The chemical formula for water is H2O.