_A2_2 Important

Question 0

Equivalence point

Answer 0

The point in a titration at which the volume of one solution has reacted exactly with the volume of the second solution

Question 1

Buffer Solution

Answer 1

A Mixture that minimise pH changes on addition of small amounts of acid or base

Question 2

End point

Answer 2

The point in a titration at which there are equal concentrations of the weak acid and conjugate base forms of the indicator

The colours at the end point is midway between the colours of the acid and conjugate base forms

Question 3

Standard enthalpy change of Neutralisation

AH neut

Answer 3

The energy change that accompanies the neutralisation of an aqueous acid by an aqueous base to form one mole of H2O
Under standard conditions

Question 4

Lattice enthalpy.

Answer 4

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

Question 5

Standard enthalpy change of formation

Answer 5

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

Question 6

enthalpy change of atomisation

Answer 6

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

Question 7

First ionisation energy

Answer 7

the energy required to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions

Question 8

Second ionisation energy

Answer 8

The erngy required to remove one electron from each ION
In one mole of gaseous 1+ ions
To form one mole of gaseous 2+ ions

Question 9

First electron affinity

Answer 9

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

Question 10

Second electron affinity

Answer 10

The enthalpy change accompanying the addition of one electron to each ion in one mole of gaseous1- ions
to form one mole of gaseous 2- ions

Question 11

Standard enthalpy change of solution

Answer 11

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

Question 12

Standard enthalpy change of hydration

Answer 12

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

Question 13

Transition element

Answer 13

A d block element that forms an ion with an incomplete d subshell

Question 14

Complex ion

Answer 14

A transition metal ion bonded to one or more ligands by coordinate bonds

Question 15

Ligand

Answer 15

A molecule or ion that can donate a pair of electrons with the transition metal ion to form a Coordinate bond

Question 16

Coordination number

Answer 16

The total number if coordinate bonds formed between a central metal ion and its ligands

Question 17

Ligand substitution

Answer 17

A reaction in which one ligand in a complex ion is replaced by another ligand

Question 18

Bidentate ligand

Answer 18

Donates 2 electron pairs/ lone pairs to a metal ion

To form 2 Coordinate bonds