AQA A LEVEL CHEMISTRY PAPER 2 7405
QUESTIONS AND CORRECT ANSWERS
◉ enthalpy of hydration. Answer: Enthalpy change when 1 mole of
gaseous ions becomes aqueous ions
◉ intial rate of reaction. Answer: The rate of reaction at time t = 0 s.
Used to compare the effect on the rate of changing the independent
variable.
◉ rate determining step. Answer: The slowest step in a reaction
mechanism
◉ equivalence point. Answer: The point during a titration when the
number of H+ ions and OH- ions are equal. This is at the middle of
the steepest part of the titration curve.
◉ buffer. Answer: A solution that resists changes in pH when small
amounts of acid or base are added.
◉ autocatalyst. Answer: Catalyst that is a reaction product
, ◉ transition metal. Answer: elements that form colored ions in
solution and have multiple oxidation states
◉ ligand. Answer: an ion or molecule with at least one lone pair of
electrons that can form a coordinate bond to a metal atom or ion
◉ complex. Answer: a central metal ion or atom surrounded by
ligands
◉ co-ordination number. Answer: Number of lone pairs bonded to
the metal ion
◉ hemoglobin. Answer: protein structure containing four haem
groups bonded to four flobular proteins - used for gas exhange
◉ chiral carbon. Answer: A carbon atom attached to four different
atoms or groups of atoms.
◉ hetregenous catalyst. Answer: A catalyst that is in a different
phase from that of the reactant substances.
◉ homogenous catalyst. Answer: A catalyst that is in the same phase
as all the reactants and products in a reaction system
QUESTIONS AND CORRECT ANSWERS
◉ enthalpy of hydration. Answer: Enthalpy change when 1 mole of
gaseous ions becomes aqueous ions
◉ intial rate of reaction. Answer: The rate of reaction at time t = 0 s.
Used to compare the effect on the rate of changing the independent
variable.
◉ rate determining step. Answer: The slowest step in a reaction
mechanism
◉ equivalence point. Answer: The point during a titration when the
number of H+ ions and OH- ions are equal. This is at the middle of
the steepest part of the titration curve.
◉ buffer. Answer: A solution that resists changes in pH when small
amounts of acid or base are added.
◉ autocatalyst. Answer: Catalyst that is a reaction product
, ◉ transition metal. Answer: elements that form colored ions in
solution and have multiple oxidation states
◉ ligand. Answer: an ion or molecule with at least one lone pair of
electrons that can form a coordinate bond to a metal atom or ion
◉ complex. Answer: a central metal ion or atom surrounded by
ligands
◉ co-ordination number. Answer: Number of lone pairs bonded to
the metal ion
◉ hemoglobin. Answer: protein structure containing four haem
groups bonded to four flobular proteins - used for gas exhange
◉ chiral carbon. Answer: A carbon atom attached to four different
atoms or groups of atoms.
◉ hetregenous catalyst. Answer: A catalyst that is in a different
phase from that of the reactant substances.
◉ homogenous catalyst. Answer: A catalyst that is in the same phase
as all the reactants and products in a reaction system
