1. Stoichiometric Relationships

Question 1

Compound

Answer 1

A pure substance when two or more elements combine chemically

Question 2

Mixture

Answer 2

Two or more substances mixed together

Question 3

Homogeneous mixture

Answer 3

A mixture that has the same composition throughout. It only consists of one phase, such as a solution or a mixture of gases

Question 4

Heterogeneous mixture

Answer 4

A mixture that does not have uniform composition and consists of separate phases

Question 5

Relative atomic mass (Ar)

Answer 5

The average mass of the naturally occurring isotopes of the element relative to the mass of 1/12 of an atom of carbon-12

Question 6

Relative molecular mass (Mr)

Answer 6

The mass of a molecule of the compound relative to the mass of 1/12 of an atom of carbon-12

Question 7

Mole

Answer 7

The amount of substance that contains 6.02x10^23 particles

Question 8

Empirical formula

Answer 8

The simplest whole number ratio of the elements present in a compound

Question 9

Molecular formula

Answer 9

The total number of atoms of each element present in a molecule of the compound