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Definitions > Enthalpy Change > Flashcards

Enthalpy Change Flashcards

1
Q

What is enthalpy change of formation?

A

ΔfH - the enthalpy change when 1 mole of a compound is formed from its constituent elements all products and reactants in their standard states under standard conditions.

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2
Q

What is the enthapy change of atomisation of an element?

A

ΔatH - is the enthalpy change when 1 mole of gaseous atoms is formed from an element in its standard states

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3
Q

What is the enthalpy of atomisation of a compound?

A

ΔatH, is the enthalpy change when 1 mole of a compound in its standard state is converted to gaseous atoms

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4
Q

What is first ionisation energy?

A

Δie1H - is the enthalpy change when 1 mole of gaseous 1+ ions is formed from 1 mole of gaseous atoms

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5
Q

What is second ionisation energy?

A

Δie2H - is the enthalpy change when 1 mole of gaseous 2+ ions are formed from 1 mole of gaseous 1+ ions

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6
Q

What is first electron affinity?

A

Δea1H - is the enthalpy change when 1 mole of gaseous 1- ions is formed from 1 mole of gaseous atoms

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7
Q

What is second electron affinity?

A

Δea2H - is the enthalpy change when 1 mole of gaseous 2- ions is formed from 1 mole of gaseous 1 - ions.

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8
Q

What is bond disassociation enthalpy?

A

ΔdissH - the e enthalpy change when all the bonds of the same type in 1 mole of gaseous molecules are broken

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9
Q

What is enthalpy change of hydration?

A

ΔhydH - is the enthalpy change when 1 mole of aqueous ions is formed from 1 mole of gaseous ions

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10
Q

What is enthalpy change of solution?

A

ΔsolH - is the enthalpy change when 1 mole of solute is dissolved in enough solvent that no further enthalpy change occurs on further dilution.

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11
Q

What is lattice enthalpy of formation?

A

enthalpy change when one mole of solid ionic lattice is formed from its constituent gaseous ions

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12
Q

What is lattice enthalpy of disassociation?

A

enthalpy change when when one mole of solid ionic lattice is completely disassociated into its gaseous ions

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13
Q

What is entropy?

A

randomness/disorder of a system; higher value for entropy = more disordered (J mol-1 K-1)

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14
Q

What is Gibbs free energy?

A

ΔG = ΔH - TΔS
If G < 0, reaction is feasible. If G = 0, reaction is JUST feasible. If G > 0, reaction is not feasible.

Gibbs free energy is a term that combines the effect of enthalpy and entropy into one number

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15
Q

What is the enthalpy change of combustion?

A

The enthalpy change when one mole of a substance is completely burnt in oxygen

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Definitions (1 decks)

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