AQA AS LEVEL CHEMISTRY FINAL EXAM
QUESTIONS 2025/2026 WITH CORRECT
DETAILED ANSWERS || ALREADY GRADED
A+ <RECENT VERSION>
1. Atom economy - ANSWER Describes the efficiency of a chemical
reaction by comparing the total number of atoms in the product with the total
number of atoms in the starting materials
2. Percentage yield - ANSWER The practical efficiency of the process
3. Ionic bonding - ANSWER A chemical bond between metals and non-
metals where electrons are transferred from the metal to the non-metal to
form 2 oppositely charged ions that form electrostatic forces between them
4. Covalent bonding - ANSWER A chemical bond between non-metal atoms
where a pair of electrons is shared
5. Lattice - ANSWER A regular 3D arrangement of atoms, ions or
molecules
,6. Co-ordinate bond - ANSWER Where both electrons come from one of the
atoms in a covalent bond
7. Dative covalent bond - ANSWER Where both electrons come from one
of the atoms in a covalent bond
8. Lone pair - ANSWER A pair of electrons in the outer shell of an electron
that isn't involved in a bond
9. Metallic bonding - ANSWER A chemical bond between metals where
outer electrons are delocalised within the lattice of metal ions
10.Electronegativity - ANSWER The power of an atom to attract the electron
density in a covalent bond towards itself
11.Electron density - ANSWER The probability of electrons being found in a
particular volume of space
12.Polarity - ANSWER The unequal sharing of the electrons between atoms
in a covalent bond
13.Polar - ANSWER Describes a molecule where the charge is not equally
distributed, one end is more positive, the other more negative
,14.Dipole-dipole forces - ANSWER An intermolecular force between two
molecules with permanent dipoles
15.van der Waals forces - ANSWER An intermolecular force between all
atoms and molecules caused by instantaneous dipoles which form very weak
electrostatic attractions
16.Hydrogen bonding - ANSWER An intermolecular force between a
slightly positive hydrogen atom and a much more electronegative atom
which forms a strong interaction
17.Electron pair repulsion theory - ANSWER Suggests that the electrons
surrounding the central atom in the atoms repel each other, therefore the
atoms form a shape where they are furthest away from each other
18.Enthalpy change - ANSWER The heat energy change measured under
constant pressure whilst temperature depends on the average kinetic energy
of the particles
19.Enthalpy change of vaporisation - ANSWER The energy required to turn
a substance from a liquid to a gas
20.Electrical current - ANSWER Usually carried by delocalised electrons or
ions
, 21.Simple molecular structure - ANSWER Composed of small molecules
held together by covalent bonds
22.Macromolecular structure - ANSWER Large numbers of atoms are linked
in a regular 3D shape by covalent bonds
23.Giant ionic structure - ANSWER Consists of a lattice of positive ions
each surrounded by negative ions and vive versa
24.Metallic structure - ANSWER Consists of a regular lattice of positively
charged metal ions held together by a cloud of delocalised electrons
25.Low boiling points - ANSWER Simple molecular compounds melting
and boiling points
26.High boiling points - ANSWER Giant structures general melting and
boiling points
27.Energy to break bonds - ANSWER Energy put in
28.Energy to make bonds - ANSWER Energy given out
29.Exothermic reaction - ANSWER Heat energy given out as the reactants
change to the products
QUESTIONS 2025/2026 WITH CORRECT
DETAILED ANSWERS || ALREADY GRADED
A+ <RECENT VERSION>
1. Atom economy - ANSWER Describes the efficiency of a chemical
reaction by comparing the total number of atoms in the product with the total
number of atoms in the starting materials
2. Percentage yield - ANSWER The practical efficiency of the process
3. Ionic bonding - ANSWER A chemical bond between metals and non-
metals where electrons are transferred from the metal to the non-metal to
form 2 oppositely charged ions that form electrostatic forces between them
4. Covalent bonding - ANSWER A chemical bond between non-metal atoms
where a pair of electrons is shared
5. Lattice - ANSWER A regular 3D arrangement of atoms, ions or
molecules
,6. Co-ordinate bond - ANSWER Where both electrons come from one of the
atoms in a covalent bond
7. Dative covalent bond - ANSWER Where both electrons come from one
of the atoms in a covalent bond
8. Lone pair - ANSWER A pair of electrons in the outer shell of an electron
that isn't involved in a bond
9. Metallic bonding - ANSWER A chemical bond between metals where
outer electrons are delocalised within the lattice of metal ions
10.Electronegativity - ANSWER The power of an atom to attract the electron
density in a covalent bond towards itself
11.Electron density - ANSWER The probability of electrons being found in a
particular volume of space
12.Polarity - ANSWER The unequal sharing of the electrons between atoms
in a covalent bond
13.Polar - ANSWER Describes a molecule where the charge is not equally
distributed, one end is more positive, the other more negative
,14.Dipole-dipole forces - ANSWER An intermolecular force between two
molecules with permanent dipoles
15.van der Waals forces - ANSWER An intermolecular force between all
atoms and molecules caused by instantaneous dipoles which form very weak
electrostatic attractions
16.Hydrogen bonding - ANSWER An intermolecular force between a
slightly positive hydrogen atom and a much more electronegative atom
which forms a strong interaction
17.Electron pair repulsion theory - ANSWER Suggests that the electrons
surrounding the central atom in the atoms repel each other, therefore the
atoms form a shape where they are furthest away from each other
18.Enthalpy change - ANSWER The heat energy change measured under
constant pressure whilst temperature depends on the average kinetic energy
of the particles
19.Enthalpy change of vaporisation - ANSWER The energy required to turn
a substance from a liquid to a gas
20.Electrical current - ANSWER Usually carried by delocalised electrons or
ions
, 21.Simple molecular structure - ANSWER Composed of small molecules
held together by covalent bonds
22.Macromolecular structure - ANSWER Large numbers of atoms are linked
in a regular 3D shape by covalent bonds
23.Giant ionic structure - ANSWER Consists of a lattice of positive ions
each surrounded by negative ions and vive versa
24.Metallic structure - ANSWER Consists of a regular lattice of positively
charged metal ions held together by a cloud of delocalised electrons
25.Low boiling points - ANSWER Simple molecular compounds melting
and boiling points
26.High boiling points - ANSWER Giant structures general melting and
boiling points
27.Energy to break bonds - ANSWER Energy put in
28.Energy to make bonds - ANSWER Energy given out
29.Exothermic reaction - ANSWER Heat energy given out as the reactants
change to the products
