Elements Compounds and Mixtures Flashcard 2024

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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 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 sodium chloride (NaCl).

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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. Mixtures can be homogeneous (uniform composition) or heterogeneous (distinct components).

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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. An example is saltwater.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture where the components are not uniformly distributed. An example is a salad.

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What is the difference between a pure substance and a mixture?

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A pure substance has a constant composition and distinct properties, while a mixture contains two or more substances that retain their individual properties.

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What is an alloy?

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An alloy is a mixture of two or more metals, or a metal and another element, that has metallic properties. An example is bronze, which is made of copper and tin.

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How can mixtures be separated?

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Mixtures can be separated by physical methods such as filtration, distillation, or using a magnet.

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What is density?

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Density is the mass of a substance divided by its volume. It is often used to help separate mixtures.

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What is the significance of the periodic table?

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The periodic table organizes all known elements based on their properties and atomic structure, helping to predict their behavior.