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A level OCR A chemistry Questions & 100% Correct Answers- Latest Test | Graded A+ | Passed
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rate of reaction ֎ -:- the change in concentration of a reactant or product per unit time rate constant (k) ֎ -:- The constant that links the rate of reaction with the concentrations of the reactants raised to the powers of their orders in the rate equation. half-life ֎ -:- The time taken...

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  • August 26, 2024
  • 28
  • 2024/2025
  • Exam (elaborations)
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Excellence is key | 2024/2025 ~Page |1



A level OCR A chemistry Questions &
100% Correct Answers- Latest Test |
Graded A+ | Passed
rate of reaction


֎ -:- the change in concentration of a reactant or product per unit time




rate constant (k)


֎ -:- The constant that links the rate of reaction with the concentrations of the

reactants raised to the powers of their orders in the rate equation.




half-life


֎ -:- The time taken for the concentration of the reactant to reduce by half




Benzene


֎ -:- a naturally occurring aromatic compound, which is a very stable planar ring

structure with delocalised electrons




Model


֎ -:- a simplified version that allows us to make predictions and understand

observations more easily




26/08/2024 | © Copyright- This work may not be copied for profit.

, Excellence is key | 2024/2025 ~Page |2


Lattice enthalpy


֎ -:- The enthalpy change that accompanies the formation of one mole of an

ionic lattice from its gaseous ions under standard conditions

e.g. K+(g) + Cl-(g) -> KCl(s)


- enthalpy change




standard enthalpy change of formation


֎ -:- The enthalpy change that takes place when one mole of a compound is

formed from its constituent elements in their standard states under standard

conditions.

e.g. K(s) + 1/2Cl2(g) -> KCl(s)


- enthalpy change




standard enthalpy change of atomisation


֎ -:- The enthalpy change that takes place when one mole of gaseous atoms

forms from the element in its standard state.

e.g. K(s) -> K(g)


+ enthalpy change




First electron affinity (opposite of first ionisation energy!)




26/08/2024 | © Copyright- This work may not be copied for profit.

, Excellence is key | 2024/2025 ~Page |3


֎ -:- The enthalpy change that takes place when one electron is added to each

atom in one mole of gaseous atoms to form one mole of gaseous 1- ions

e.g. Cl(g) + e- -> Cl-(g)


- 1st enthalpy change


+ 2nd enthalpy change as electron is repelled by 1- ion




standard enthalpy change of solution


֎ -:- The enthalpy change that takes place when one mole of a solute is

completely dissolved in water under standard conditions

e.g. KCl(s) -> K+(aq) + Cl-(aq)


+ enthalpy change




standard enthalpy change of hydration


֎ -:- The enthalpy change that takes place when one mole of gaseous ions is

dissolved in water forming one mole of aqueous ions under standard

conditions

e.g. K+(g) -> K+(aq)


- enthalpy change




Entropy




26/08/2024 | © Copyright- This work may not be copied for profit.

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