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AQA A-level Chemistry paper 2 Study Guide Solutions Relative atomic mass (Ar) - ANSWER-Average mass of an atom compared with one twelth of the mass of an atom of carbon 12 Electronegativity - ANSWER-Power of an atom to attract the pair of electrons in a covalent bond Standard enthalpy of combu...

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  • November 10, 2024
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AQA A-level Chemistry paper 2 Study

Guide Solutions


Relative atomic mass (Ar) - ANSWER✔✔-Average mass of an atom compared with one twelth of the

mass of an atom of carbon 12


Electronegativity - ANSWER✔✔-Power of an atom to attract the pair of electrons in a covalent bond


Standard enthalpy of combustion - ANSWER✔✔-Enthalpy change when 1 mole of a substance burns

completely in oxygen under standard conditions with all reactants and products being in their standard

state


Standard enthalpy of formation - ANSWER✔✔-Enthalpy change when 1 mole of a compound is formed

from it's elements under standard conditions in their standard states


Mean bond enthalpy - ANSWER✔✔-The average energy needed to break a certain type of bond over a

range of compounds


Activation energy - ANSWER✔✔-Minimum energy required for colliding molecules to react


Maxwell-Boltzmann distribution x and y axes - ANSWER✔✔-x: Energy


y: fraction/number of molecules


What happens to the Maxwell-Boltzmann curve when temperature increases - ANSWER✔✔-Moves

down and to the right


Rate of reaction - ANSWER✔✔-Rate at which product formed/reactant used up

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Order of reaction - ANSWER✔✔-Power to which the concentration of a species is raised in the rate

equation


rearrange k=Ae^-Ea/Rt - ANSWER✔✔-lnk=-Ea/Rt+lnA


Conditions for thermal cracking - ANSWER✔✔-High temperature and high pressure


Products of thermal cracking - ANSWER✔✔-High % of alkenes


Conditions for catalytic cracking - ANSWER✔✔-High temperature ,slight pressure and in the presence of

a zeolite catalyst


Products of catalytic cracking - ANSWER✔✔-Motor fuels and aromatic hydrocarbons


Why do we crack alkanes? - ANSWER✔✔-Smaller alkanes/alkenes generally more useful than longer

chain ones


Equation for complete combustion of alkanes - ANSWER✔✔-alkane + oxygen > carbon dioxide + water


Equations for incomplete combustion of alkanes - ANSWER✔✔-alkane + oxygen > carbon

monoxide/carbon + water


Pollutants produced by combustion engines - ANSWER✔✔-NOx, CO, C and sunburned hydrocarbons


Reaction of methane with chlorine - ANSWER✔✔-I: Cl2 > 2Cl•


P: CH4 + Cl• > CH3• + Chi


CH3• + Cl2 > CH3Cl + Cl•


T: CH3• + Cl• > CH3Cl


2 equations showing decomposition of the ozone - ANSWER✔✔-Cl• + O3 > ClO• + O2

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