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Chemistry Module 1 > Lattice Enthalaply > Flashcards

Lattice Enthalaply Flashcards

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1
Q

Definition of:

Standard Enthalapy of Formation

A

Enthalapy change when 1 mol of a compound is formed from its elements under standard conditions

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2
Q

Definition of:

Standard lattice Enthalapy

A

Enthalapy change when 1 lol of an ionic compound is converted into gaseous ions

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3
Q

Definition of:

Standard Enthalapy of atomisation

A

Enthalapy change when 1 mol of gaseous atoms is formed from the element in its standard state

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4
Q

Definition of:

1st ionisation energy

A

Energy required to convert 1 mol of gaseous atoms into gaseous ions with a single positive charge

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5
Q

Definition of:

Bond dissociation Enthalapy (BDE)

A

Energy required to break 1 mol of a covalent bond under standard conditions

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6
Q

Definition of:

1st electron affinity

A

Enthalapy change when 1 mol of gaseous atoms is converted to gaseous ions with a single negative charge.

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7
Q

Endothermic processes have what type of arrows

A

Upwards

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8
Q

Exothermic processes have what type of arrows

A

Downwards

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9
Q

Which processes are exothermic?

A

Enthalapy of formation and 1st electron affinity

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10
Q

Which processes are endothermic?

A

Lattice Enthalapy, Enthalapy of atomisation, bond dissociation Enthalapy, 1st IE, 2nd IE, 2nd EA

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11
Q

Give the equation for lattice Enthalapy

A

DeltaH latt = -DeltaH f + DeltaH at + DeltaH 1stIE + DeltaH at + DeltaH EA1

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12
Q

Why is the 2nd EA of an oxide endothermic?

A

The 2nd electron is being added to an already negative ion so there is repulsion between the O and e

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13
Q

Do smaller ions have a larger or smaller lattice Enthalapy?

A

Larger

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14
Q

Give the definition of enthalpy of hydration

A

Enthalpy change when 1 mol of gaseous ions is converted into aqueous ions

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15
Q

Definition of enthalpy of solution

A

Enthalpy change when 1 mol of a solute dissolves in water

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16
Q

Give the equation for enthalpy of solution

A

Enthalpy of solution = lattice enthalpy + enthalpy of hydration

17
Q

Are enthalpy values of hydration endo or exothermix

A

Exothermic as heat is released when bonds w/ H2O are formed

Chemistry Module 1 (10 decks)

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