Chemistry Review

Front 1

Relative Atomic Mass (Ar)

Back 1

The weighted mean of the masses of the naturally occurring isotopes, on a scale in which the mass of an atom of the carbon-12 isotope is 12 units exactly.

Front 2

Relative Molecular Mass (Mr)

Back 2

The sum of the relative atomic masses of the constituent elements, as given in the molecular formula. Relative Formula Mass - The same as the Relative Molecular Mass, but it only applies to ionic compounds.

Front 3

Empirical Formula

Back 3

The simplest whole number ratio of atoms of different elements in the compound

Front 4

Molecular Formula

Back 4

The actual number of atoms of different elements covalently bonded in a molecule

Front 5

Solute

Back 5

This is the substance which has been dissolved. Solvent - The bulk substance in which the solute was dissolved

Front 6

Solution

Back 6

This is made up of the solute and the solvent. The solution is called aqueous if the solvent is water

Front 7

Concentration

Back 7

This is an expression of how much solute there is dissolved in the solution. This can be expressed in g dm-3 or mol dm-3.

Front 8

Atomic Number (A)

Back 8

the number of protons in the nucleus. Since atoms are electrically neutral, the number of protons is also equal to the number of electrons.

Front 9

Isotopes of an Element

Back 9

Atoms of the same element with the same number of protons, but with a different number of neutrons

Front 10

Mass Number (Z)

Back 10

The total number of protons and neutrons in an element