2024 OCR A-LEVEL CHEMISTRY PAPER 3 LATEST UPDATE EXAM WITH QUESTIIONS AND WELL VERIFIED CORRECT ANSWERS //GURANTEED PASS!!
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Course
2024 OCR A-LEVEL CHEMISTRY PAPER 3
Institution
2024 OCR A-LEVEL CHEMISTRY PAPER 3
2024 OCR A-LEVEL CHEMISTRY PAPER 3
LATEST UPDATE EXAM WITH
QUESTIIONS AND WELL VERIFIED CORRECT
ANSWERS //GURANTEED PASS!!
What does Hess's Law state? - ANSWER-The total enthalpy change of a reaction
is always the same no matter which route is taken known as conserva...
2024 OCR A-LEVEL CHEMISTRY PAPER 3
LATEST UPDATE EXAM 2024-2025 WITH
QUESTIIONS AND WELL VERIFIED CORRECT
ANSWERS //GURANTEED PASS!!
What does Hess's Law state? - ANSWER-The total enthalpy change of a reaction
is always the same no matter which route is taken known as conservation of
energy.
Definition for enthalpy change of hydration - ANSWER-Is the enthalpy change
when 1 mol of gaseous ions dissolves in water
Definition for enthalpy change of solution - ANSWER-Is the enthalpy change
when 1 mol of solute dissolves in water
How do reactive metals effect electrode potential? - ANSWER-More reactive a
metal, more it wants to lose electrons and therefore the more negative the standard
electrode potentials
What conditions effect the value of electrode potential? - ANSWER-Equilibrium
position is affected by temp, conc. and pressure and changing the equilibrium
position effects the cell potential.
, What to include when making one compound from another? - ANSWER-1) Any
special procedures such as refluxing
2) Conditions needed (high temp, pressure or presence of a catalyst
What happens when gaseous atoms combine with an ionic lattice? - ANSWER-
Energy is given out - called lattice enthalpy
Define standard lattice enthalpy - ANSWER-The enthalpy change when 1 mole of
an ionic lattice is formed from its gaseous ions under standard conditions
How does ionic charge and size effect lattice enthalpy? - ANSWER-Higher the
charge of the ions, more energy released when ionic lattice formed due to stronger
electrostatic forces between ions.
More energy released = more negative the lattice enthalpy
What two things take place when ionic lattice dissolves in water? - ANSWER-1)
bonds between ions break to give gaseous ions which is endothermic. Enthalpy
change is opposite to lattice enthalpy
2) Bonds between the gaseous atoms ions and the water are made which is
exothermic and enthalpy change here is called the enthalpy change of hydration.
How do reactive non-metals effect electrode potential? - ANSWER-More reactive
a non-metal more it wants to gain electrons and therefore more positive the
standard electrode potentials.
How do reaction kinetics effect the electrode potential value? - ANSWER-1) rate
of reaction may be so slow that the reaction might not appear to happen
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