Chapter 18 Chemistry and Physics

Copper, sulfur, and oxygen are examples of

• elements

• compounds

• mixtures

• colloids

Tags

NGSS.MS-PS1-1

A chemical ______ tells what elements a compound contains and the exact number of the atoms of each element in a unit of that compound.

• formula

• table

• dot diagram

• chart

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-7

H₂O is also known as ______.

• carbon

• mercury

• nickel

• water

A chemical ______ is the force that holds atoms together in a compound.

• bond

• element

• compound

• formula

A charged particle is known as a(n) ______.

• plasma

• gas

• ion

• neutron

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

The attraction that forms between atoms when they share electrons is known as

a(n) ______ bond.

• ionic

• covalent

• simple

• net

Elements can unite chemically to form compounds.

• true

• false

Tags

NGSS.HS-PS1-1

A covalent bond is the force of attraction between the opposite charges of the ions in

an ionic compound.

• true

• false

Answer explanation

ionic bond

A neutral particle that forms as the result of electron sharing is called an ion.

• true

• false

Answer explanation

a molecule

A nonpolar molecule has a slightly positive end and a slightly negative end.

• true

• false

Answer explanation

polar