Elements, Compounds, Mixtures

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What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together. It has unique properties different from the individual elements.

Tags

NGSS.MS-PS1-1

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. Each substance retains its own properties.

Front

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

Back

A homogeneous mixture has a uniform composition throughout (e.g., saltwater), while a heterogeneous mixture has a non-uniform composition (e.g., salad).

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together. It can consist of the same or different types of atoms.

Tags

NGSS.MS-PS1-1

Front

What is the atomic structure of helium?

Back

Helium is an element made up of atoms that contain two protons and two electrons, and it exists as a single atom in its gaseous form.

Tags

NGSS.MS-PS1-1

Front

How can you identify an element?

Back

An element can be identified by the fact that it contains only one kind of atom and cannot be separated into simpler substances.

Front

What is the significance of the periodic table?

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

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Front

What is an example of a compound?

Back

Water (H2O) is a compound made up of two hydrogen atoms and one oxygen atom chemically bonded together.

Tags

NGSS.MS-PS1-1

Front

What is an example of a homogeneous mixture?

Back

An example of a homogeneous mixture is vinegar, which has a consistent composition throughout.