2. Atoms, Molecules And Stoichiometry

Question 1

Define the unified atomic mass

Answer 1

One twelfth of the mass of a carbon 12 atom

Question 2

Define relative atomic mass

Answer 2

The ratio of the average mass of the atoms of an element to the unified atomic mass unit.

Question 3

Define relative isotopic mass

Answer 3

The mass of a particular atom of an isotope compared to the value of the unified atomic mass unit

Question 4

Define relative molecular mass

Answer 4

The ratio of weighted average mass of a molecule of a molecular compound to the unified atomic mass unit

Question 5

Define the term empirical formula

Answer 5

The simplest whole number ratio of the elements present in one molecule or formula unit of the compound

Question 6

Define the term molecular formula

Answer 6

The formula that shows the number and type of each atom in a molecule.

Question 7

What is water of crystallization

Answer 7

When some compounds can form crystals which have water as part of their structure

Question 8

What do you call a substance that contains water of crystallization

Answer 8

a hydrated compound

Question 9

What do you call a compound that does not contain water of crystallization

Answer 9

Anhydrous compound