AAB MT CHEMISTRY EXAM 2025 /2026 WITH
100% ACCURATE SOLUTIONS ALREADY
GRADED A+
Question:1
Explain why a fluoride ion is larger than a sodium ion. - ANSWER-They both have
the same number of electrons, but Sodium has a higher proton number so a
higher nuclear charge, meaning the electrons will be pulled in greater, making
the atomic radius of Sodium decrease.
Question:2
Explain, in terms of structure and bonding, why the melting point of sodium
fluoride is high. - ANSWER-Sodium fluoride lattice has lots of strong ionic bonds
and electrostatic forces between oppositely charged ions which hold the ions
together closely, and require a lot of energy to overcome.
Question:3
Name the type of bond formed when HF reacts with H+. Explain how this bond is
formed. - ANSWER-Dative Covalent bond. Two electrons from F are shared with
the H+ ion.
Question:4
Draw the shape of the SbF6- ion and the shape of the H2F+ ion. Include any lone
pairs that influence the shape. Name the shape of each ion. - ANSWER-SbF6- =
octahedral, H2F+ ion = bent
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, Question:5
BOND ENTHALPY OF C-F - ANSWER-484 kJ/mol
Question:6
Describe how the molecules are ionised using electro spray ionisation. - ANSWER-
1) sample dissolved in volatile solvent and injected through fine needle to give
fine mist. 2) tip of needle is attached to high voltage supply. 3) particles gain a
proton from solvent as they leave the needle, producing singly positively
charged ions. 4) solvent evaporates.
Question:7
Give the formula of the ion that reaches the detector first in the TOF mass
spectrometer. - ANSWER-FIRST OPTION
Question:8
Give an equation, including state symbols, for the process that occurs during the
ionisation of a germanium atom. - ANSWER-Ge (g) -> Ge+ (g) + e-
Question:9
Complete the full electron configuration of a chromium atom. - ANSWER-[Ar] 3d5
4s1 BUT WRITE OUT FULLY
Question:10
Deduce the oxidation state of chromium in the Cr2O7^2- ion. - ANSWER-+6
2|Page
100% ACCURATE SOLUTIONS ALREADY
GRADED A+
Question:1
Explain why a fluoride ion is larger than a sodium ion. - ANSWER-They both have
the same number of electrons, but Sodium has a higher proton number so a
higher nuclear charge, meaning the electrons will be pulled in greater, making
the atomic radius of Sodium decrease.
Question:2
Explain, in terms of structure and bonding, why the melting point of sodium
fluoride is high. - ANSWER-Sodium fluoride lattice has lots of strong ionic bonds
and electrostatic forces between oppositely charged ions which hold the ions
together closely, and require a lot of energy to overcome.
Question:3
Name the type of bond formed when HF reacts with H+. Explain how this bond is
formed. - ANSWER-Dative Covalent bond. Two electrons from F are shared with
the H+ ion.
Question:4
Draw the shape of the SbF6- ion and the shape of the H2F+ ion. Include any lone
pairs that influence the shape. Name the shape of each ion. - ANSWER-SbF6- =
octahedral, H2F+ ion = bent
1|Page
, Question:5
BOND ENTHALPY OF C-F - ANSWER-484 kJ/mol
Question:6
Describe how the molecules are ionised using electro spray ionisation. - ANSWER-
1) sample dissolved in volatile solvent and injected through fine needle to give
fine mist. 2) tip of needle is attached to high voltage supply. 3) particles gain a
proton from solvent as they leave the needle, producing singly positively
charged ions. 4) solvent evaporates.
Question:7
Give the formula of the ion that reaches the detector first in the TOF mass
spectrometer. - ANSWER-FIRST OPTION
Question:8
Give an equation, including state symbols, for the process that occurs during the
ionisation of a germanium atom. - ANSWER-Ge (g) -> Ge+ (g) + e-
Question:9
Complete the full electron configuration of a chromium atom. - ANSWER-[Ar] 3d5
4s1 BUT WRITE OUT FULLY
Question:10
Deduce the oxidation state of chromium in the Cr2O7^2- ion. - ANSWER-+6
2|Page
