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Chemistry > Energetics > Flashcards

Energetics Flashcards

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1
Q

What is enthalpy change

A

heat or energy change under constant pressure

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2
Q

What is the equation for energy change

A

energy change= mass x specific heat capacity x temp change

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3
Q

What is hess law

A

The enthalpy change for a reaction is independent of the the route taken

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4
Q

What is Enthalpy change of formation

A

Enthalpy change when 1 mole of a compound is formed from is constituent elements in their standard state and under standard conditions

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5
Q

Enthalpy change of formation arrows go

A

upwards

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6
Q

how to workout bond enthalpy

A

Reactants - products both in positive form

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7
Q

What is enthalpy change of combustion

A

Enthalpy change when 1 mole of a compound is burned completely in oxygen when all reactants and products are in their standard state and under standard conditions

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8
Q

What is enthalpy change of combustion

A

Enthalpy change when 1 mole of a compound is burned completely in oxygen when all reactants and products are in their standard state and under standard conditions

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9
Q

Enthalpy change of combustion arrows go

A

downwards

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10
Q

Enthalpy of atomisation/bond enthalpy

A

When 1 mol of gaseous atoms are formed from an element in their standard state

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11
Q

Enthalpy of 1st ionisation

A

when 1 mol of gaseous +1 ions are formed from 1 mol of gaseous atoms

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12
Q

Enthalpy of electron affinity

A

When 1 mol of gaseous -1 ions are formed from 1 mol of gaseous atoms

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13
Q

Enthalpy of lattice formation

A

when 1 mol of solid ionic compound is formed from its from its gaseous ions

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14
Q

Enthalpy of lattice dissociation

A

When 1 mol of solid ionic compound separates into its gaseous ions

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15
Q

Enthalpy of hydration

A

when 1 mol of aqueous ions is formed from 1 mol of gaseous ions

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16
Q

Enthalpy of solution

A

When 1 mol of solute is dissolved in enough solvent so that no further enthalpy change occurs in further distillation

17
Q

bond dissociation

A

When a covalent bond is broken into 2 gaseous atoms

18
Q

When does covalent character occur

A

Relatively small ion has high positive charger, relatively larger ion with high negative charge bond together

Chemistry (10 decks)

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