AQA AS Chemistry 7404/2 Paper 2 June 2024 Question
Paper & Mark Scheme STUDY BUNDLE PACKAGE WITH
SOLUTIONS
Mass number - ANSWERTotal number of protons and neutrons.
Atomic number - ANSWERNumbers of protons in the nucleus and number of
electrons in shells.
Negative Ions - ANSWERMore electrons than protons.
Positive ions - ANSWERMore protons than electrons.
Relative isotopic mass - ANSWERmass of an atom of an isotope of an element on a
scale where an atom of carbon12 is 12.
Relative atomic mass - ANSWERaverage mass of an atom of an element on a scale
where an atom of carbon12 is 12.
Relative molecular mass - ANSWERaverage mass of a molecule on a scale where an
atom of carbon12 is 12.
First ionisation energy - ANSWERthe energy needed too remove 1 electron from
each atom in 1 mole of gaseous atoms to form 1 mole of gaseous 1+ ions.
Second ionisation energy - ANSWERthe energy needed to remove 1 electron from
each ion in 1 mole of gaseous 1+ ions to form 1 mole of gaseous 2+ ions.
Number of particles= - ANSWERNumber of moles x Avagadros constant (6.02 x
10^23)
Number of moles= - ANSWERMass / Mr
Number of moles= - ANSWERConcentration (moldm^-3) x Volume (dm^3)
Methyl orange indicator - ANSWERyellow in acid, red in alkali. Commonly used in
titrations.
Phenolphthalein indicator - ANSWERpink in alkali, colourless in acid. Commonly used
in titrations.
Avogadros constant - ANSWERthe number of atoms in 12g of carbon12 (6.02 x
10^23)
Ideal gas equation - ANSWERPv= nRT
, Empirical formula - ANSWERsimplest whole number ratio of atoms of each element
in a compound.
Molecular formula - ANSWERgives the actual numbers of each element in a
molecule.
Percentage yield - ANSWERhow much product was actually made compared with the
amount of product that was expected
theoretical yield - ANSWERthe maximum mass of product expected in a reaction.
actual yield - ANSWERthe mass of product that is actually obtained in a reaction.
Atom economy - ANSWERmeasure of the efficiency of a chemical reaction. The
proportional mass of reactants that actually become part of the desired product in a
balanced chemical equation.
Ionic bonding - ANSWERIons (metal and non metal) are held together by
electrostatic forces of attraction due to the transferring of electrons. Eg: Sodium
chloride.
Mass spectrometer - ANSWERAn instrument used to accurately determine the
relative atomic mass. Separates atoms or molecules (gaseous positive ions)
according to their charge and mass.
Orbital - ANSWERRegion in space where one is likely to find up to two electrons with
opposite spin.
Covalent Bonding - ANSWERholds molecules together by sharing electrons between
non-metals. Eg: I2, Graphite, Diamond.
Dative Covalent Bonding - ANSWERWhere both electrons are provided by one atom
for a covalent bond.
Linear molecule - ANSWER2 bonds 180 degree angles 2D e.g: CO2
Trigonal planar molecule - ANSWER3 bonds 120 degree angles 2D e.g: BF3
Tetrahedral molecule - ANSWER4 bonds 109.5 degree angles 3D e.g: CH4
Trigonal bipyramid molecule - ANSWER5 bonds 120 degree and 90 degree angles 3D
e.g.: PCl5
Octahedral molecule - ANSWER6 bonds 90 degree angles 3D e.g.: SF6
Lone pairs - ANSWERCause a repulsion of 2.5 degrees.
Paper & Mark Scheme STUDY BUNDLE PACKAGE WITH
SOLUTIONS
Mass number - ANSWERTotal number of protons and neutrons.
Atomic number - ANSWERNumbers of protons in the nucleus and number of
electrons in shells.
Negative Ions - ANSWERMore electrons than protons.
Positive ions - ANSWERMore protons than electrons.
Relative isotopic mass - ANSWERmass of an atom of an isotope of an element on a
scale where an atom of carbon12 is 12.
Relative atomic mass - ANSWERaverage mass of an atom of an element on a scale
where an atom of carbon12 is 12.
Relative molecular mass - ANSWERaverage mass of a molecule on a scale where an
atom of carbon12 is 12.
First ionisation energy - ANSWERthe energy needed too remove 1 electron from
each atom in 1 mole of gaseous atoms to form 1 mole of gaseous 1+ ions.
Second ionisation energy - ANSWERthe energy needed to remove 1 electron from
each ion in 1 mole of gaseous 1+ ions to form 1 mole of gaseous 2+ ions.
Number of particles= - ANSWERNumber of moles x Avagadros constant (6.02 x
10^23)
Number of moles= - ANSWERMass / Mr
Number of moles= - ANSWERConcentration (moldm^-3) x Volume (dm^3)
Methyl orange indicator - ANSWERyellow in acid, red in alkali. Commonly used in
titrations.
Phenolphthalein indicator - ANSWERpink in alkali, colourless in acid. Commonly used
in titrations.
Avogadros constant - ANSWERthe number of atoms in 12g of carbon12 (6.02 x
10^23)
Ideal gas equation - ANSWERPv= nRT
, Empirical formula - ANSWERsimplest whole number ratio of atoms of each element
in a compound.
Molecular formula - ANSWERgives the actual numbers of each element in a
molecule.
Percentage yield - ANSWERhow much product was actually made compared with the
amount of product that was expected
theoretical yield - ANSWERthe maximum mass of product expected in a reaction.
actual yield - ANSWERthe mass of product that is actually obtained in a reaction.
Atom economy - ANSWERmeasure of the efficiency of a chemical reaction. The
proportional mass of reactants that actually become part of the desired product in a
balanced chemical equation.
Ionic bonding - ANSWERIons (metal and non metal) are held together by
electrostatic forces of attraction due to the transferring of electrons. Eg: Sodium
chloride.
Mass spectrometer - ANSWERAn instrument used to accurately determine the
relative atomic mass. Separates atoms or molecules (gaseous positive ions)
according to their charge and mass.
Orbital - ANSWERRegion in space where one is likely to find up to two electrons with
opposite spin.
Covalent Bonding - ANSWERholds molecules together by sharing electrons between
non-metals. Eg: I2, Graphite, Diamond.
Dative Covalent Bonding - ANSWERWhere both electrons are provided by one atom
for a covalent bond.
Linear molecule - ANSWER2 bonds 180 degree angles 2D e.g: CO2
Trigonal planar molecule - ANSWER3 bonds 120 degree angles 2D e.g: BF3
Tetrahedral molecule - ANSWER4 bonds 109.5 degree angles 3D e.g: CH4
Trigonal bipyramid molecule - ANSWER5 bonds 120 degree and 90 degree angles 3D
e.g.: PCl5
Octahedral molecule - ANSWER6 bonds 90 degree angles 3D e.g.: SF6
Lone pairs - ANSWERCause a repulsion of 2.5 degrees.
