Elements, Compounds, and Mixtures

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What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. Examples include salad and air.

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What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together. An example is table salt (NaCl).

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 oxygen (O) and gold (Au).

Front

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

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A homogeneous mixture has a uniform composition throughout, like lemonade, while a heterogeneous mixture has distinct, separate components, like salad.

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What is an example of a homogeneous mixture?

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Lemonade is an example of a homogeneous mixture because it has a uniform composition.

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What is an example of a heterogeneous mixture?

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Salad is an example of a heterogeneous mixture because it contains different components that are not uniformly distributed.

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How many elements are in the periodic table?

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As of now, there are 118 known elements in the periodic table.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H2O, which means it is made of two hydrogen atoms and one oxygen atom.

Front

What is the process of separating a mixture called?

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The process of separating a mixture is called filtration, distillation, or chromatography, depending on the method used.

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What is the main characteristic of a compound?

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The main characteristic of a compound is that it has a fixed composition and specific properties that are different from the individual elements.