Elements, compounds and mixtures

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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 are chemically bonded together. Examples include water (H2O) and sodium chloride (NaCl).

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What is a homogeneous mixture?

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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?

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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 solution?

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A solution is a homogeneous mixture composed of a solute dissolved in a solvent. Examples include sugar water and vinegar.

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What is a solute?

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A solute is the substance that is dissolved in a solution. For example, in saltwater, salt is the solute.

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What is a solvent?

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A solvent is the substance that does the dissolving in a solution and is present in greater quantity. For example, in saltwater, water is the solvent.

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How can you classify water?

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Water is classified as a compound because it is made up of two hydrogen atoms and one oxygen atom (H2O).

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How can you classify salt?

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Salt is classified as a compound because it is made up of sodium and chloride ions (NaCl).

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What is the difference between a compound and a mixture?

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A compound is a substance formed from two or more elements chemically bonded together, while a mixture is a combination of two or more substances that retain their individual properties.