A level chemistry paper 2 questions and
answers latest top
score Latest 2025.
Silver nitrate+ nitric acid + chloride ions - ANS.White precipitate
Silver nitrate+ nitric acid + bromide ions - ANS.Cream precipitate
Silver nitrate+ nitric acid + iodide ions - ANS.Yellow precipitate
Substances that decolorise bromine water - ANS.Alkenes
Electrophiles - ANS.Electron pair acceptors, attracted to electrons e.g H+
NaF and NaCl - ANS.Produces misty fumes with conc sulphuric acid
NaBr - ANS.Produces misty and orange/brown fumes with conc sulphuric acid
NaI - ANS.Produces misty fumes, purple vapour, bad egg smell with conc sulphuric
acid
Le chateliers principle - ANS.If a factor affecting the equilibrium is changed the
equilibrium will shift to oppose this change
Enthalpy change - ANS.The overall temperature change at a constant pressure of a
reaction
, Hess's law - ANS.The overall enthalpy change of a reaction at a constant pressure is
independent to the route taken
Why does E-Z isomerism occur - ANS.Due to the restriction of the double carbon
bond
Positional isomers - ANS.The functional group is attached to a different carbon
Functional group isomers - ANS.Same atoms arranged into different functional groups
e.g cyclohexane and hexene
Dative covalent bond - ANS.A bond of shared electrons where both electrons are
supplied from one of the atoms
Kelvin - ANS.Temperature in degrees Celsius + 273
Metres cubed - ANS.The unit of volume in ideal gas equation
Number of particles= - ANS.Number of moles x avogadros constant
Linear - ANS.2 bonding pairs, 0 lone pairs, 180 bond angle
Trigonal planar - ANS.3 bonding pairs, 0 lone pairs, 120 bond angle
Tetrahedral - ANS.4 bonding pairs, 0 lone pairs, 109.5 bond angle
Trigonal bipyramidal - ANS.5 bonding pairs, 0 lone pairs, 90 and 120 bond angle
Pyramidal - ANS.3 bonding pairs, 1 lone pair, 107 bond angle
Bent/ v shaped - ANS.2 lone pairs, 2 bonding pairs, 104.5 bond angle
Octahedral - ANS.6 bonding pairs, 0 lone pairs , 90 bond angle
T shaped - ANS.2 lone pairs, 3 bond pairs
Electronegativity - ANS.The power of an atom to attract the pair of electrons in a
covalent bond
Standard conditions - ANS.100kPa and 298k
Standard enthalpy of formation - ANS.The enthalpy change when 1 mole of a
substance is formed from its elements under standard conditions
Standard enthalpy of combustion - ANS.The enthalpy change when 1 mole of a
substance undergoes complete combustion under standard conditions
answers latest top
score Latest 2025.
Silver nitrate+ nitric acid + chloride ions - ANS.White precipitate
Silver nitrate+ nitric acid + bromide ions - ANS.Cream precipitate
Silver nitrate+ nitric acid + iodide ions - ANS.Yellow precipitate
Substances that decolorise bromine water - ANS.Alkenes
Electrophiles - ANS.Electron pair acceptors, attracted to electrons e.g H+
NaF and NaCl - ANS.Produces misty fumes with conc sulphuric acid
NaBr - ANS.Produces misty and orange/brown fumes with conc sulphuric acid
NaI - ANS.Produces misty fumes, purple vapour, bad egg smell with conc sulphuric
acid
Le chateliers principle - ANS.If a factor affecting the equilibrium is changed the
equilibrium will shift to oppose this change
Enthalpy change - ANS.The overall temperature change at a constant pressure of a
reaction
, Hess's law - ANS.The overall enthalpy change of a reaction at a constant pressure is
independent to the route taken
Why does E-Z isomerism occur - ANS.Due to the restriction of the double carbon
bond
Positional isomers - ANS.The functional group is attached to a different carbon
Functional group isomers - ANS.Same atoms arranged into different functional groups
e.g cyclohexane and hexene
Dative covalent bond - ANS.A bond of shared electrons where both electrons are
supplied from one of the atoms
Kelvin - ANS.Temperature in degrees Celsius + 273
Metres cubed - ANS.The unit of volume in ideal gas equation
Number of particles= - ANS.Number of moles x avogadros constant
Linear - ANS.2 bonding pairs, 0 lone pairs, 180 bond angle
Trigonal planar - ANS.3 bonding pairs, 0 lone pairs, 120 bond angle
Tetrahedral - ANS.4 bonding pairs, 0 lone pairs, 109.5 bond angle
Trigonal bipyramidal - ANS.5 bonding pairs, 0 lone pairs, 90 and 120 bond angle
Pyramidal - ANS.3 bonding pairs, 1 lone pair, 107 bond angle
Bent/ v shaped - ANS.2 lone pairs, 2 bonding pairs, 104.5 bond angle
Octahedral - ANS.6 bonding pairs, 0 lone pairs , 90 bond angle
T shaped - ANS.2 lone pairs, 3 bond pairs
Electronegativity - ANS.The power of an atom to attract the pair of electrons in a
covalent bond
Standard conditions - ANS.100kPa and 298k
Standard enthalpy of formation - ANS.The enthalpy change when 1 mole of a
substance is formed from its elements under standard conditions
Standard enthalpy of combustion - ANS.The enthalpy change when 1 mole of a
substance undergoes complete combustion under standard conditions
