AQA A Level Chemistry- Definitions
Paper 2 2024/2025 Exam Questions and
Answers | A+ Score Assured
spectator ion - 🧠 ANSWER ✔✔ion which does not take part in a reaction
ionic lattice - 🧠 ANSWER ✔✔ionic solid formed with the ions held in a
three-dimensional framework
coordinate bond - 🧠 ANSWER ✔✔a bond containing a shared pair of
electrons with both electrons supplied by one atom
allotropes - 🧠 ANSWER ✔✔different forms of the same element in the
same physical state (diamond and graphite)
electronegativity - 🧠 ANSWER ✔✔the power of an atom to attract the pair
of electrons in a covalent bond
induced dipole - 🧠 ANSWER ✔✔a temporary dipole caused by electrons
being more distributed to one side of an atom than the other and another
molecule approaching this side will have its electrons repelled
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 1
STATEMENT. ALL RIGHTS RESERVED
, enthalpy change - 🧠 ANSWER ✔✔heat energy change at constant
pressure
activation energy - 🧠 ANSWER ✔✔minimum amount of energy needed for
reacting particles to successfully collide
standard enthalpy value - 🧠 ANSWER ✔✔the delta H values for enthalpy
changes of specific reactions measured under standard conditions
conservation of energy - 🧠 ANSWER ✔✔law stating energy cannot be
created or destroyed, just converted from one form to another
Hess' Law - 🧠 ANSWER ✔✔law stating the enthalpy change for a chemical
reaction is independent of the route taken and depends only on the initial
and final states
mean bond enthalpy - 🧠 ANSWER ✔✔measure of energy required to break
one mole of a covalent bond measured in the gaseous state averaged
across many compounds containing the bond
dynamic equilibrium - 🧠 ANSWER ✔✔where you have a steady state
because the rates of the forward reaction and reverse reaction are the
same
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 2
STATEMENT. ALL RIGHTS RESERVED
Paper 2 2024/2025 Exam Questions and
Answers | A+ Score Assured
spectator ion - 🧠 ANSWER ✔✔ion which does not take part in a reaction
ionic lattice - 🧠 ANSWER ✔✔ionic solid formed with the ions held in a
three-dimensional framework
coordinate bond - 🧠 ANSWER ✔✔a bond containing a shared pair of
electrons with both electrons supplied by one atom
allotropes - 🧠 ANSWER ✔✔different forms of the same element in the
same physical state (diamond and graphite)
electronegativity - 🧠 ANSWER ✔✔the power of an atom to attract the pair
of electrons in a covalent bond
induced dipole - 🧠 ANSWER ✔✔a temporary dipole caused by electrons
being more distributed to one side of an atom than the other and another
molecule approaching this side will have its electrons repelled
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 1
STATEMENT. ALL RIGHTS RESERVED
, enthalpy change - 🧠 ANSWER ✔✔heat energy change at constant
pressure
activation energy - 🧠 ANSWER ✔✔minimum amount of energy needed for
reacting particles to successfully collide
standard enthalpy value - 🧠 ANSWER ✔✔the delta H values for enthalpy
changes of specific reactions measured under standard conditions
conservation of energy - 🧠 ANSWER ✔✔law stating energy cannot be
created or destroyed, just converted from one form to another
Hess' Law - 🧠 ANSWER ✔✔law stating the enthalpy change for a chemical
reaction is independent of the route taken and depends only on the initial
and final states
mean bond enthalpy - 🧠 ANSWER ✔✔measure of energy required to break
one mole of a covalent bond measured in the gaseous state averaged
across many compounds containing the bond
dynamic equilibrium - 🧠 ANSWER ✔✔where you have a steady state
because the rates of the forward reaction and reverse reaction are the
same
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 2
STATEMENT. ALL RIGHTS RESERVED
