The mole concept and empirical formula (terms and definitions)

Question 1

Defined as the mass equal to 1/12 the mass of an atom of carbon -12.

Answer 1

Atomic mass unit

Question 2

mass of the atom in amu

Answer 2

atomic mass

Question 3

This term is used to pertain to the amount or number of atoms, particles, molecules, or ions in a given substance.

Answer 3

Mole

Question 4

The term (1)_______ is used for free elements existing in single atom. The term (2)____________ is used for covalent compounds and (3)_____________ for ionic compounds. Use (4)________ for charged particles.

Answer 4

(1) atom
(2) molecule
(3) formula units
(4) ions

Question 5

defined as the mass of a given chemical element or compound divided by the amount of substance.

Answer 5

molar mass

Question 6

The sum of the atomic masses of the atoms in a molecule.

Answer 6

molecular mass

Question 7

For compounds that are not molecular, it is improper to used the term molecular mass. Instead, _____________ is used for compounds that are not molecular.

Answer 7

formula mass

Question 8

It is the smallest possible whole number ratio of different atoms in a compound.

Answer 8

Empirical formula

Question 8

Refers to the percent by mass of an element present in a compound.

Answer 8

Percentage composition

Question 9

It is derived by comparing the compound’s molecular or molar mass to its empirical formula mass.

Answer 9

Molecular formula