Molecules, Elements, and Compounds

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element.

Tags

NGSS.MS-PS1-1

Front

What is a molecule?

Back

A group of two or more atoms bonded together.

Tags

NGSS.MS-PS1-1

Front

What is a compound?

Back

A molecule that is formed from two different elements/atoms.

Tags

NGSS.MS-PS1-1

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the difference between a molecule and a compound?

Back

A molecule is a group of atoms bonded together, while a compound is a molecule made of different elements.

Tags

NGSS.MS-PS1-1

Front

What is a mixture?

Back

A combination of two or more substances that are not chemically bonded.

Front

Can a molecule be made of the same type of atom?

Back

Yes, a molecule can consist of two or more of the same type of atom, such as O2 (oxygen gas).

Tags

NGSS.MS-PS1-1

Front

What is a chemical formula?

Back

A way to represent a compound using symbols for its constituent elements and numbers to show the ratio of atoms.

Tags

NGSS.MS-PS1-5

Front

What is a pure substance?

Back

A material that has a constant composition and consistent properties throughout.

Tags

NGSS.MS-PS1-4

Front

What is the atomic number?

Back

The number of protons in the nucleus of an atom, which determines the element's identity.