Elements, Compounds, and Mixtures

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What is an Element?

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A substance that cannot be broken down into simpler substances. Examples include hydrogen (H), oxygen (O), and gold (Au).

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What is a Compound?

Back

A substance formed when two or more elements are chemically bonded together. Example: Water (H2O) is a compound made of hydrogen and oxygen.

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What is a Mixture?

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

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What is a Homogeneous Mixture?

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A mixture that has a uniform composition throughout. Example: Saltwater.

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What is a Heterogeneous Mixture?

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A mixture that does not have a uniform composition. Example: A salad or a bowl of mixed nuts.

Front

How many elements are in the compound Na2CO3?

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3 (Sodium, Carbon, and Oxygen).

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What is the chemical formula for water?

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H2O, which consists of 2 hydrogen atoms and 1 oxygen atom.

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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, while a mixture is a combination of substances that are not chemically bonded.

Front

What is the chemical symbol for Sodium?

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Na.

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What is the chemical formula for sulfuric acid?

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H2SO4, which consists of 2 hydrogen, 1 sulfur, and 4 oxygen atoms.