Chapter 20 Physical Science

Question 1

Binary Compound

Answer 1

One that is composed of two elements.

Question 2

Chemical Bond

Answer 2

The force that holds atoms together in a compound.

Question 3

Chemical Formula

Answer 3

Tells what elements a compound contains and the exact number of the atoms of each element in a unit of that compound.

Question 4

Covalent Bond

Answer 4

The attraction that forms between atoms when they share electrons.

Question 5

Hydrate

Answer 5

A compound that has water chemically attached to ions and written into its chemical formula.

Question 6

Ion

Answer 6

A charged particle because it now has either more or fewer electrons than protons.

Question 7

Ionic Bond

Answer 7

The force of attraction between the opposite charges of the ions in an ionic compound.

Question 8

Molecule

Answer 8

A neutral particle that forms as a result of electron sharing.

Question 9

Nonpolar molecule

Answer 9

One in which electrons are shared equally in bonds. Such a molecule does not have oppositely charged ends.

Question 10

Oxidation number

Answer 10

Tells you how many electrons an atom has gained, lost, or shared to become stable.

Question 11

Polar molecule

Answer 11

One that has a slightly positive end and a slightly negative end although the overall molecule is neutral.

Question 12

Polyatomic Ion

Answer 12

A positively or negatively charged, covalently bonded group of atoms.