F321 TEST WITH COMPLETE SOLUTIONS
Isotopes - ANSWER Atoms of the same element with different numbers of neutrons and
different masses
Relative Isotopic Mass - ANSWER The mass of an atom of an isotope compared with
1/12th of the mass of an atom of Carbon-12
Relative Atomic Mass - ANSWER The weighted mean mass of an atom of an element
compared with 1/12th of the mass of an atom of Carbon-12
Relative Molecular Mass - ANSWER The weighted mean mass of a molecule compared
with 1/12th of the mass of an atom of Carbon-12
Relative Formula Mass - ANSWER The weighted mean mass of a formula unit compared
with 1/12th of the mass of an atom of Carbon-12
Amount of Substance - ANSWER The quantity whose unit is the mole. Chemists use
'amount of substance' as a means of counting atoms
Mole - ANSWER The amount of any substance containing as many particle as there are
in exactly 12g of Carbon-12
Avogadro's Constant - ANSWER The amount of atoms per mole of Carbon-12: 6.02
x10^23
Molar Mass: M - ANSWER The mass per mole of a substance. (gmol^-1)
Empirical Formula - ANSWER The simplest whole number ratio of atoms of each element
present in a compound
Molecular Formula - ANSWER The number of atoms of each element in a molecule
Concentration - ANSWER The amount of solute, in mol, per 1dm^3 of solution
Acid - ANSWER A species that is a proton donor
Alkali - ANSWER A type of base that dissolves in water forming an alkaline solution
Base - ANSWER A species that is a proton acceptor
Salt - ANSWER A chemical compound formed from an acid, when a H+ ion has been
replaced by a metal ion or another positive ion (NH4)
Anhydrous - ANSWER A substance containing no water molecules
Hydrated - ANSWER Crystalline and containing water molecules
Water of Crystallisation - ANSWER Water molecules that form an essential part of the
Isotopes - ANSWER Atoms of the same element with different numbers of neutrons and
different masses
Relative Isotopic Mass - ANSWER The mass of an atom of an isotope compared with
1/12th of the mass of an atom of Carbon-12
Relative Atomic Mass - ANSWER The weighted mean mass of an atom of an element
compared with 1/12th of the mass of an atom of Carbon-12
Relative Molecular Mass - ANSWER The weighted mean mass of a molecule compared
with 1/12th of the mass of an atom of Carbon-12
Relative Formula Mass - ANSWER The weighted mean mass of a formula unit compared
with 1/12th of the mass of an atom of Carbon-12
Amount of Substance - ANSWER The quantity whose unit is the mole. Chemists use
'amount of substance' as a means of counting atoms
Mole - ANSWER The amount of any substance containing as many particle as there are
in exactly 12g of Carbon-12
Avogadro's Constant - ANSWER The amount of atoms per mole of Carbon-12: 6.02
x10^23
Molar Mass: M - ANSWER The mass per mole of a substance. (gmol^-1)
Empirical Formula - ANSWER The simplest whole number ratio of atoms of each element
present in a compound
Molecular Formula - ANSWER The number of atoms of each element in a molecule
Concentration - ANSWER The amount of solute, in mol, per 1dm^3 of solution
Acid - ANSWER A species that is a proton donor
Alkali - ANSWER A type of base that dissolves in water forming an alkaline solution
Base - ANSWER A species that is a proton acceptor
Salt - ANSWER A chemical compound formed from an acid, when a H+ ion has been
replaced by a metal ion or another positive ion (NH4)
Anhydrous - ANSWER A substance containing no water molecules
Hydrated - ANSWER Crystalline and containing water molecules
Water of Crystallisation - ANSWER Water molecules that form an essential part of the
