AQA Alevel Chemistry Paper 1 35 Questions With Correct Answers
Module
NU1426
Institution
NU1426
AQA A-level Chemistry Paper 1 |35 Questions| With Correct Answers.
Explain what is meant by the term co-ordinate bond
Define the term Ligand
What can lattice enthalpy defined as? (2 things)
Why is the experimental value for lattice dissociation of some compounds greater than the theoretical val...
AQA A-level Chemistry Paper 1 EXAM
QUESTIONS (35 TERMS) WITH VERIFIED
DEFINITIONS UPDATED 2024
1). Explain what is meant by the term co-ordinate bond
Ans: a covalent bond in which both electrons are donated by one atom
2). Define the term ligand
Ans: Atom, ion or molecule which can donate a pair of electrons to a metal ion
3). What can lattice enthalpy defined as? (2 things)
Ans: Lattice enthalpy of formation and lattice enthalpy of dissociation
4). Why is the experimental value for lattice dissociation of some compounds greater than the
theoretical value?
Ans: the bonding is not 100% ionic/ there is some covalent character/ there is
additional covalent bonding
5). What does the perfect ionic model assume?
Ans: The bonding in the compound is not 100% ionic. In the model the ions are perfect
spheres/point charges are not distorted
6). What 2 things might cause a different lattice enthalpy?
Ans: Enthalpy of bond dissociation (eg halogens)
Enthalpy of formation
7). Why is the lattice enthalpy greater for ions with a high charge?
Ans: There is a stronger attraction
Why is the lattice enthalpy greater for smaller ions?
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, 8).
Ans: smaller ions are more closely packed in the lattice
there is a stronger attraction
9). What is the relationship between enthalpy of lattice dissociation and enthalpy of lattice
formation?
Ans: same numerical value but different signs
10). State hess' law
Ans: Enthalpy change for any chemical reaction is independent of the route taken, and
depends only on the initial and final states.
11). Why is the second electron affinity endothermic?
Ans: Repulsion of the negative ion with the negative electron being added
12). Define enthalpy of hydration
Ans: The enthalpy change when 1 mole of gaseous ions is converted to one mole of
aqueous ions
13). What does enthalpy of solution equal?
Ans: enthalpy of solution = lattice dissociation + enthalpy of hydration
(^H(solution)=^H(lattice dissociation)+^H(hydration))
14). What happens when and ionic compound dissolves in water?
Ans: the ionic lattice breaks up (enthalpy of lattice dissociation )
the polar water molecules form bonds with the ions (enthalpy of hydration)
15). Define enthalpy of solution
Ans: the enthalpy change when one mole of ionic compounds dissolves in water to
form a solution of infinite dilution
16). Why do some compounds have covalent character?
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