AS Enthalpy, Born haber Flashcards Preview

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Flashcards in AS Enthalpy, Born haber Deck (14)
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1
Q

homogenous equilibrium

A

all species are in the same physical state

2
Q

Heterogenous equilibrium

A

Species are in different states

3
Q

Methods to determine equilibrium concentrations

A
  • titration = remove portion to titrate from reaction mixture
  • colorimeter = darker colour can mean higher conc and higher absorbance
4
Q

standard enthalpy of neutralisation

A

The enthalpy change when an aqueous acid is neutralised by an aqueous base to form ONE MOLE OF H2O under standard conditions

5
Q

Lattice enthalpy

A

Enthalpy change when one mole of an ionic lattice is formed from its constituent gaseous ions

6
Q

Hydration enthalpy

A

Enthalpy change when one mole of a gaseous ion dissolves in excess water to give an infinitely dilute solution

7
Q

Enthalpy of solution

A

Enthalpy change when one mole of a substance dissolves in an excess of solvent to give an infinitely dilute solution

8
Q

Enthalpy

A

The heat content stored in a chemical system

9
Q

Activation energy

A

The minimum energy required to start a reaction by the breaking of bonds

10
Q

Hess’ Law

A

if a reaction can take place by more than one route and the initial and final conditions are the same, the total enthalpy change is the same for each route

11
Q

Average bond enthalpy

A

The average enthalpy change that takes place when breaking by homolytic fission 1 mole of a given type of bond in the molecules of a gaseous species

12
Q

Standard enthalpy change of formation

A

Enthalpy change when 1 mole of a compound is formed from its constituent elements in their standard states, under standard conditions

13
Q

Standard enthalpy change of combustion

A

Enthalpy change when 1 mole of a substance (element or compound) reacts completely with oxygen under standard conditions

14
Q

Standard enthalpy change of reaction

A

Enthalpy change that accompanies a reaction under standard conditions in the molar quantities expressed in a chemical equation, all reactants and products being in their standard states