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AQA Alevel Chemistry Paper 1 35 Questions With Correct Answers
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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...

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  • April 9, 2024
  • 5
  • 2023/2024
  • Exam (elaborations)
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  • chemistry

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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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