Elements, Compounds, and Mixtures

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 hydrogen, oxygen, and gold.

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What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together. Examples include water (H2O) and carbon dioxide (CO2).

Front

What is a mixture?

Back

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

Front

How can you identify an element?

Back

An element can be identified by its unique properties, such as atomic number, symbol, and its position on the periodic table.

Front

How can you identify a compound?

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A compound can be identified by its chemical formula, which shows the elements and the number of atoms of each element in the compound.

Front

How can you identify a mixture?

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A mixture can be identified by the presence of two or more substances that retain their individual properties and can be separated by physical means.

Front

What is the difference between an element and a compound?

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An element is a single type of atom, while a compound consists of two or more different types of atoms chemically bonded together.

Front

What is an atom?

Back

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

Front

Can mixtures be homogeneous or heterogeneous?

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Yes, mixtures can be homogeneous (uniform composition, like saltwater) or heterogeneous (distinct components, like a salad).

Front

What is a chemical bond?

Back

A chemical bond is a force that holds atoms together in a compound. The main types are ionic bonds and covalent bonds.