Review Atoms, Elements, Molecules, and Compounds

Front

What is an atom?

Back

The smallest unit of an element, consisting of protons, neutrons, and electrons.

Tags

NGSS.MS-PS1-1

Front

What is an element?

Back

A pure substance made of only one type of atom.

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 substance formed when two or more different types of atoms bond together.

Tags

NGSS.MS-PS1-1

Front

How are molecules and compounds different?

Back

Compounds must have atoms from different elements, while molecules can consist of the same or different elements.

Tags

NGSS.MS-PS1-1

Front

What is a pure substance?

Back

A material made of only one type of particle, which can be an element or a compound.

Tags

NGSS.MS-PS1-4

Front

What is the chemical formula for water?

Back

H₂O, which indicates it is made of two hydrogen atoms and one oxygen atom.

Tags

NGSS.MS-PS1-1

Front

What is the difference between a molecule and a compound?

Back

All compounds are molecules, but not all molecules are compounds; some molecules consist of the same type of atoms.

Tags

NGSS.MS-PS1-1

Front

What is ozone?

Back

A molecule made up of three oxygen atoms (O₃), which is different from other compounds.

Tags

NGSS.MS-PS1-1

Front

What is a proton?

Back

A positively charged particle found in the nucleus of an atom.