Atoms, Elements, Molecules, Compounds, Mixtures

Front

What is the definition of an atom?

Back

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

Tags

NGSS.MS-PS1-1

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is a substance formed when two or more different types of atoms bond together.

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 mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition and appearance throughout.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture that has a non-uniform composition and appearance, where the different components can be easily distinguished.

Front

Give an example of a homogeneous mixture.

Back

An example of a homogeneous mixture is saltwater.

Front

Give an example of a heterogeneous mixture.

Back

An example of a heterogeneous mixture is a salad.

Front

What is the significance of the chemical formula NaCl?

Back

NaCl is the chemical formula for sodium chloride, which is a compound formed from sodium and chlorine atoms.

Tags

NGSS.MS-PS1-1

Front

Why are all compounds also considered molecules?

Back

All compounds are considered molecules because they consist of two or more atoms bonded together, but not all molecules are compounds.

Tags

NGSS.MS-PS1-1