Atoms & Mol. Part 2

___ occurs when a compound is formed.

• mixture
• chemical reaction
• molecule
• compound

Air is a mixture of several different kinds of molecules.

• True
• False

Tags

NGSS.MS-PS1-1

An oxygen molecule usually has two oxygen atoms.

• True
• False

Tags

NGSS.MS-PS1-1

Hydrogen is a compound.

• True
• False

Carbon dioxide is a compound.

• True
• False

Salt is an example of a compound.

• True
• False

Two or more atoms joined together make up a _____.

• compound
• molecule
• solution

A substance that is made up of atoms of more than one element is a _______. 

• compound
• rust
• molecule

The center of an atom is the _____.

• electron
• nucleus
• neutron

In an expression H2O the "2" represents ____.

• 2 atoms of hydrogen
• 2 atoms of oxygen
• 2 molecules of water

Tags

NGSS.MS-PS1-1