AQA A-level Chemistry paper 2
QUESTIONS AND VERIFIED
CORRECT ANSWERS
GRADED A+ LATEST 100%
GUARANTEED PASS
Products of thermal cracking - CORRECT ANSWER-High % of alkenes
Conditions for catalytic cracking - CORRECT ANSWER-High temperature ,slight pressure and in
the presence of a zeolite catalyst
Products of catalytic cracking - CORRECT ANSWER-Motor fuels and aromatic hydrocarbons
Why do we crack alkanes? - CORRECT ANSWER-Smaller alkanes/alkenes generally more useful
than longer chain ones
Equation for complete combustion of alkanes - CORRECT ANSWER-alkane + oxygen > carbon
dioxide + water
Equations for incomplete combustion of alkanes - CORRECT ANSWER-alkane + oxygen > carbon
monoxide/carbon + water
Pollutants produced by combustion engines - CORRECT ANSWER-NOx, CO, C and sunburned
hydrocarbons
Reaction of methane with chlorine - CORRECT ANSWER-I: Cl2 > 2Cl•
P: CH4 + Cl• > CH3• + Chi
, CH3• + Cl2 > CH3Cl + Cl•
T: CH3• + Cl• > CH3Cl
2 equations showing decomposition of the ozone - CORRECT ANSWER-Cl• + O3 > ClO• + O2
ClO• + O3 > 2O2 + Cl•
What types of mechanism do haloalkanes undergo? - CORRECT ANSWER--Nucleophilic
substitution by aqueous hydroxide ions, cyanide ions or ammonia
-Elimination with ethanolic hydroxide ions
What type of mechanism do alkenes undergo? - CORRECT ANSWER-Electrophilic addition by
bromine, hydrogen bromide or sulphuric acid
Test for primary or secondary alcohols - CORRECT ANSWER-Warm with acidified potassium
dichromate (VI) and positive result is Solution turning green
Tests for aldehyde or ketone - CORRECT ANSWER--Warm with Fehlings Solution - brick red
precipitate indicates aldehyde
-Warm with Tollens reagent (silver nitrate + sodium hydroxide + dilute ammonia) - aldehyde
gives a silver mirror
Test for alkenes - CORRECT ANSWER-Shake with bromine water- alkene goes from Orange to
colourless
Test for carboxylic acids - CORRECT ANSWER-Sodium carbonate and effervescence is positive
Relative stabilities of carbocations - CORRECT ANSWER-tertiary>secondary>primary
QUESTIONS AND VERIFIED
CORRECT ANSWERS
GRADED A+ LATEST 100%
GUARANTEED PASS
Products of thermal cracking - CORRECT ANSWER-High % of alkenes
Conditions for catalytic cracking - CORRECT ANSWER-High temperature ,slight pressure and in
the presence of a zeolite catalyst
Products of catalytic cracking - CORRECT ANSWER-Motor fuels and aromatic hydrocarbons
Why do we crack alkanes? - CORRECT ANSWER-Smaller alkanes/alkenes generally more useful
than longer chain ones
Equation for complete combustion of alkanes - CORRECT ANSWER-alkane + oxygen > carbon
dioxide + water
Equations for incomplete combustion of alkanes - CORRECT ANSWER-alkane + oxygen > carbon
monoxide/carbon + water
Pollutants produced by combustion engines - CORRECT ANSWER-NOx, CO, C and sunburned
hydrocarbons
Reaction of methane with chlorine - CORRECT ANSWER-I: Cl2 > 2Cl•
P: CH4 + Cl• > CH3• + Chi
, CH3• + Cl2 > CH3Cl + Cl•
T: CH3• + Cl• > CH3Cl
2 equations showing decomposition of the ozone - CORRECT ANSWER-Cl• + O3 > ClO• + O2
ClO• + O3 > 2O2 + Cl•
What types of mechanism do haloalkanes undergo? - CORRECT ANSWER--Nucleophilic
substitution by aqueous hydroxide ions, cyanide ions or ammonia
-Elimination with ethanolic hydroxide ions
What type of mechanism do alkenes undergo? - CORRECT ANSWER-Electrophilic addition by
bromine, hydrogen bromide or sulphuric acid
Test for primary or secondary alcohols - CORRECT ANSWER-Warm with acidified potassium
dichromate (VI) and positive result is Solution turning green
Tests for aldehyde or ketone - CORRECT ANSWER--Warm with Fehlings Solution - brick red
precipitate indicates aldehyde
-Warm with Tollens reagent (silver nitrate + sodium hydroxide + dilute ammonia) - aldehyde
gives a silver mirror
Test for alkenes - CORRECT ANSWER-Shake with bromine water- alkene goes from Orange to
colourless
Test for carboxylic acids - CORRECT ANSWER-Sodium carbonate and effervescence is positive
Relative stabilities of carbocations - CORRECT ANSWER-tertiary>secondary>primary
