Enthalpy Change Flashcards

1
Q

Enthalpy change of reaction

A

The standard enthalpy change of reaction is the energy change when molar quantities
of reactants as stated in the balanced stoichiometric equation react together at 298 K and 1 bar.

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2
Q

Standard enthalpy change of formation

A

The standard enthalpy change of formation is the energy change when one mole of
a substance is formed from its constituent elements in their standard states at 298 K
and 1 bar.

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3
Q

Standard enthalpy change of combustion, ΔHc

A

The standard enthalpy change of combustion is the energy released when one mole of a substance is completely burnt in excess oxygen at 298 K and 1 bar.

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4
Q

Standard enthalpy change of neutralisation, ΔHn

A

The standard enthalpy change of neutralisation is the energy released when one mole of water is formed from the reaction between an acid and an alkali at 298 K and 1 bar.

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5
Q

Standard Enthalpy Change of atomisation, ΔHat

A

The standard enthalpy change of atomisation is the energy absorbed when one mole of gaseous atoms is formed from its element in its standard state at 298 K and 1 bar.

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6
Q

Bond Energy (BE)

A

Bond energy is the energy absorbed to break one mole of covalent bonds between
two atoms in gaseous molecules to form gaseous atoms.

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7
Q

Ionisation Energy, I.E.

A

First ionisation energy (1st I.E.) of an element is the energy absorbed to remove ONE MOLE of most loosely held electrons from one mole of gaseous atoms to form one mole of GASEOUS single positively charged cations.

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8
Q

Lattice Energy, L.E.

A

Lattice energy (L.E.) of an ionic compound is the energy released when one mole of
ionic solid is formed from its constituent gaseous ions.

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9
Q

Standard Enthalpy Change of hydration, ΔHhyd

A

The standard enthalpy change of hydration is the energy released when one mole of
gaseous ions is hydrated to form an infinitely dilute solution at 298 K and 1 bar.

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10
Q

Standard Enthalpy Change of solution, ∆Hsol

A

The standard enthalpy change of solution is the energy change when one mole of
substance is completely dissolved in a solvent to form an indefinitely dilute solution at 298 K and 1 bar.

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