AQA A-Level Chemistry Paper 1 Exam with Questions and Answers – 100%
Solved
Define Bond dissociation enthalpy - ✔✔✔-the enthalpy change when one mole of covalent
bond is broken in the gaseous state
Define enthalpy of atomisation - ✔✔✔-the enthalpy change when one mole of gaseous atoms
are formed from the element in its standard states
Define enthalpy of formation - ✔✔✔-Enthalpy change when 1 mole of a substance is formed
from its constituent elements under standard conditions (all reactants and products in standard
states).
Define enthalpy of hydration - ✔✔✔-The enthalpy change when 1 mole of gaseous ions is
converted to one mole of aqueous ions
Define enthalpy of lattice dissociation - ✔✔✔-the enthalpy change when 1 mole of ionic
compound is (infinitely) separated to form its constituent gaseous ions
Define enthalpy of lattice formation - ✔✔✔-The enthalpy change when 1 mole of an ionic
compound is formed from its component gaseous ions
define enthalpy of solution - ✔✔✔-the enthalpy change when one mole of ionic compounds
dissolves in water to form a solution of infinite dilution
define first electron affinity - ✔✔✔-the enthalpy change when 1 mole of gaseous atoms gain 1
mole of electrons to form 1 mole of 1- ions.
Define first ionisation enthalpy - ✔✔✔-The enthalpy change when 1 mole of electrons is
removed from 1 mole of gaseous atoms to form 1 mole of gaseous +1 ions
, AQA A-Level Chemistry Paper 1 Exam with Questions and Answers – 100%
Solved
Define mean bond enthalpy - ✔✔✔-the energy required to break one mole of covalent bond
averaged over compounds containing that bond. (kJmol-1)
Define standard enthalpy of combustion - ✔✔✔-the enthalpy change when one mole of a
substance is burned completely in excess oxygen with all products and reactants in their
standard states under standard conditions
Define the term Ligand - ✔✔✔-Atom, ion or molecule which can donate a pair of electrons to a
metal ion
Explain what is meant by the term co-ordinate bond - ✔✔✔-a covalent bond in which both
electrons are donated by one atom
How is ionisation achieved in a mass spectrometer? - ✔✔✔-High voltage supply
Which removes electrons from a substance
This allows ions to be accelerated by an electric field
Allows them to be detected by a detector
In diatomic molecules, why can't the bond enthalpy be averaged across different compounds? -
✔✔✔-The bond only occurs in the diatomic molecule.
State Hess' law - ✔✔✔-Enthalpy change for any chemical reaction is independent of the route
taken, and depends only on the initial and final states.
What 2 things might cause a different lattice enthalpy? - ✔✔✔-Enthalpy of bond dissociation
(eg halogens)
Enthalpy of formation
Solved
Define Bond dissociation enthalpy - ✔✔✔-the enthalpy change when one mole of covalent
bond is broken in the gaseous state
Define enthalpy of atomisation - ✔✔✔-the enthalpy change when one mole of gaseous atoms
are formed from the element in its standard states
Define enthalpy of formation - ✔✔✔-Enthalpy change when 1 mole of a substance is formed
from its constituent elements under standard conditions (all reactants and products in standard
states).
Define enthalpy of hydration - ✔✔✔-The enthalpy change when 1 mole of gaseous ions is
converted to one mole of aqueous ions
Define enthalpy of lattice dissociation - ✔✔✔-the enthalpy change when 1 mole of ionic
compound is (infinitely) separated to form its constituent gaseous ions
Define enthalpy of lattice formation - ✔✔✔-The enthalpy change when 1 mole of an ionic
compound is formed from its component gaseous ions
define enthalpy of solution - ✔✔✔-the enthalpy change when one mole of ionic compounds
dissolves in water to form a solution of infinite dilution
define first electron affinity - ✔✔✔-the enthalpy change when 1 mole of gaseous atoms gain 1
mole of electrons to form 1 mole of 1- ions.
Define first ionisation enthalpy - ✔✔✔-The enthalpy change when 1 mole of electrons is
removed from 1 mole of gaseous atoms to form 1 mole of gaseous +1 ions
, AQA A-Level Chemistry Paper 1 Exam with Questions and Answers – 100%
Solved
Define mean bond enthalpy - ✔✔✔-the energy required to break one mole of covalent bond
averaged over compounds containing that bond. (kJmol-1)
Define standard enthalpy of combustion - ✔✔✔-the enthalpy change when one mole of a
substance is burned completely in excess oxygen with all products and reactants in their
standard states under standard conditions
Define the term Ligand - ✔✔✔-Atom, ion or molecule which can donate a pair of electrons to a
metal ion
Explain what is meant by the term co-ordinate bond - ✔✔✔-a covalent bond in which both
electrons are donated by one atom
How is ionisation achieved in a mass spectrometer? - ✔✔✔-High voltage supply
Which removes electrons from a substance
This allows ions to be accelerated by an electric field
Allows them to be detected by a detector
In diatomic molecules, why can't the bond enthalpy be averaged across different compounds? -
✔✔✔-The bond only occurs in the diatomic molecule.
State Hess' law - ✔✔✔-Enthalpy change for any chemical reaction is independent of the route
taken, and depends only on the initial and final states.
What 2 things might cause a different lattice enthalpy? - ✔✔✔-Enthalpy of bond dissociation
(eg halogens)
Enthalpy of formation
