Atoms, Elements, Molecules, Compounds

Front

What is the definition of an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What is an element?

Back

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

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, which can be of the same or different elements.

Tags

NGSS.MS-PS1-1

Front

What is a compound?

Back

A compound is a substance formed when two or more different types of atoms bond together.

Tags

NGSS.MS-PS1-1

Front

Are all compounds also molecules?

Back

Yes, all compounds are molecules, but not all molecules are compounds.

Tags

NGSS.MS-PS1-1

Front

What distinguishes a compound from a molecule?

Back

A compound must consist of atoms from different elements, while a molecule can consist of atoms of the same element.

Front

Give an example of a compound.

Back

Sodium chloride (NaCl) is an example of a compound.

Tags

NGSS.MS-PS1-1

Front

What is the term for two or more atoms of the same element bonded together?

Back

This is called a molecule.

Tags

NGSS.MS-PS1-1

Front

What is the chemical formula for water?

Back

The chemical formula for water is H2O, which is a compound.

Tags

NGSS.MS-PS1-1

Front

What is the difference between a mixture and a compound?

Back

A mixture is a combination of two or more substances that retain their individual properties, while a compound is a substance formed from the chemical combination of two or more different elements.