Compounds, Mixtures, Elements

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What is an element?

Back

An element is a pure substance that contains only one kind 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 atoms are chemically bonded together. An example is water (H2O), which is made of hydrogen and oxygen atoms.

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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. An example is salad, which contains various ingredients mixed together.

Front

What is an atom?

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An atom is the smallest unit of matter that retains the properties of an element. It consists of protons, neutrons, and electrons.

Front

What is the difference between a compound and a mixture?

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A compound is a chemical combination of elements, while a mixture is a physical combination of substances that can be separated.

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What is carbon dioxide (CO2)?

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Carbon dioxide is a compound made of one carbon atom and two oxygen atoms, commonly produced by respiration and combustion.

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Can elements be broken down into simpler substances?

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No, elements cannot be broken down into simpler substances by chemical means.

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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.

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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 bowl of cereal.

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What is the periodic table?

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The periodic table is a chart that organizes all known elements based on their atomic number, electron configuration, and recurring chemical properties.