AQA A-level Chemistry Pack Questions & Correct Answers/ Graded A+

Colour of MnO4- (+7 oxidation state) : purple Colour of CrO7 2- (+6 oxidation state) : orange Colour of V(O2)+ (+5 oxidation state) : yellow Colour of VO 2+ (+4 oxidation state) : blue Colour of V 3+ (+3 oxidation state) : green 2 Colour of Cr 3+ (+3 oxidation state) : green/violet Colo...

Give the full electron configuration of an Al atom and a Cr3+ ion : 1s2 2s2 2p6 3s2 3p1 1s 2s2 2p6 3s2 3p6 3d6 Deduce the formula of the ion that has a charge 2+ with the same electron : Sr2+ Deduce the formula of the compound that contains 2+ ions and 3- ions that both have the same electron...

s block : The block that belongs to hydrogen and groups 1 and 2 Elements that have their highest energy e- in s-orbitals E.G. Na 1s1 2s2 2p6 3s1 p : The block that belongs to the non-metals and metalloids Elements that have their highest energy e- in p-orbitals E.G. C 1s1 2s2 2p2 d : Transi...

Relative atomic mass : The average mass of an atom of an element, relative to 1/12th of the mass of an atom of Carbon-12 Relative molecular mass : Average mass of a molecule compared to 1/12th of the mass of a carbon-12 atom The Avogradro constant : the number of particles in a mole ideal ga...

elative atomic mass (Ar) : Average mass of an atom compared with one twelth of the mass of an atom of carbon 12 Electronegativity : Power of an atom to attract the pair of electrons in a covalent bond Standard enthalpy of combustion : Enthalpy change when 1 mole of a substance burns completel...

State the electron rules : Lowest energy filled first (3d>4s) Line up parallel Single until forced to pair Electronegativity : The ability of an atom to attract electrons within a covalent bond RAM (relative atomic mass) : Average mass of one atom compared to 1/12th the mass of a c-12 ato...

What is an organic compund? : The substances that form the basis of all living things; all contain carbon atoms What is a functional group? : An atom or a group of atoms which give organic compounds their characteristics What is a homologous series? : A group of organic compounds that react in ...