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A2 Chemistry > Energy > Flashcards

Flashcards in Energy Deck (14)
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1
Q

Hess law

A

States that 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

2
Q

Lattice enthalpy

A

The enthalpy change that accompanies the formation of one mole of an ionic compound from its gaseous ions under standard conditions

3
Q

Enthalpy change of formation

A

The enthalpy change that takes place when one mole of a compound is formed from its constituent elements in their standard states under standard conditions

4
Q

Enthalpy change of atomisation

A

The enthalpy change that takes place when one mole of gaseous atoms forms from the element in its standard state

5
Q

First ionisation energy

A

The enthalpy change that accompanies the loss of one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions

6
Q

First electron affinity

A

The enthalpy change accompanying the addition of one electron to each ion in one mole of gaseous 1- ions to form one mole of gaseous 2- ions

7
Q

Standard enthalpy change of solution

A

The enthalpy change that takes place when one mole of a compound is completely dissolved in water under standard conditions

8
Q

Standard enthalpy change of hydration

A

The enthalpy change that takes place when one mole of isolated gaseous ions is dissolved in water forming one mole of aqueous ions under standard conditions

9
Q

Entropy

A

The quantitative measure of the degree of disorder in a system

10
Q

Entropy change of reaction

A

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

11
Q

Free energy change

A

The balance between enthalpy, entropy and temperature for a process

12
Q

Oxidation

A

Loss of electrons

13
Q

Reduction

A

Gain of electrons

14
Q

Standard electrode potential

A

The emf of a half cell compared with a standard hydrogen half cell, measured at 298K with solutions of 1moldm and a gas pressure of 100 kpa