Chemistry Formulae and Concepts

Front

Define the molecular formula of a compound.

Back

The number and type of different atoms in one molecule.

Front

Define the empirical formula of a compound.

Back

The simplest whole number ratio of the different atoms or ions in a compound.

Front

Describe relative atomic mass, Ar.

Back

The average mass of the isotopes of an element compared to 1/12th of the mass of an atom of C-12

Front

Define relative molecular mass, Mr.

Back

The sum of the relative atomic masses.

(For ionic compounds, relative formula mass is used).

Front

Unit in which concentration can be measured in:

Back

g/dm³ or mol/dm³.

Front

State the unit of amount of substance.

Back

The mole, mol.

Front

What is the Avogadro constant?

Back

One mole contains 6.02 × 10²³ particles, e.g. atoms, ions, molecules.

Front

What is the molar gas volume at r.t.p.?

Back

24 dm³.