AQA A LEVEL Chemistry Exam Questions And Correct Answers
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Module
AQA A Level Chemistry
Institution
AQA A Level Chemistry
AQA A LEVEL Chemistry Exam Questions
And Correct Answers
Relative atomic mass - answerThe average mass of an atom of an element, relative to 1/12th
of the mass of an atom of Carbon-12
Relative molecular mass - answerAverage mass of a molecule compared to 1/12th of the
mass of a carbon-12 atom
...
activation energy - answer✔✔The minimum amount of energy needed to start a chemical
reaction
catalyst - answer✔✔A substance that increases the rate of a chemical reaction without being
changed by providing an alternative reaction pathway by lowering activation energy
Le Chatelier's principle - answer✔✔When a system in dynamic equilibrium is subjected to
change, the position of equilibrium will shift to oppose the change.
oxidising agents - answer✔✔electron acceptors
reducing agents - answer✔✔electron donors
Enthalpy of formation - answer✔✔Enthalpy change when one mole of a compound is formed
from its constituent elements under standard conditions in their standard states
Enthalpy of atomization - answer✔✔The energy required to produce one mole of gaseous atoms
from an element in its standard state
Electron affinity - answer✔✔the enthaply change when one mole of gaseous atoms forms one
mole of -1 ions
Lattice enthalpy of formation - answer✔✔Enthalpy change when one mole of a solid ionic
compound is formed from its constituent ions in the gas phase
Lattice enthalpy of dissociation - answer✔✔Energy change when 1 mol of an ionic lattice
dissociates to its gaseous ions.
standard electrode potential - answer✔✔298K
100kPa
1.00moldm-3
Electrode reactions in lithium cell
(negative electrode) - answer✔✔Li → Li+ + e-
Electrode reactions in hydrogen-oxygen fuel cell in acidic conditions
(positive electrode) - answer✔✔02 + 4H+ +4e- -> 2H20
Electrode reactions in hydrogen-oxygen fuel cell in acidic conditions
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