Enthaply and Entropy

Question 1

what does the lattice enthaply mean?

Answer 1

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

Question 2

latice enthaply down a group

Answer 2

ionic rradius increases

attraction between ions decreases

lattice energy less negative

melting point decreases

Question 3

lattice enthaply across a period

Answer 3

ionic charge increases

attraction between opns increases

lattice enthaply more neagive

melting point increases

Question 4

can we measure lattice enthaply directly?

Answer 4

No, we use an enthaply diagram to work it out

Question 5

what is the standard enthaply change of atomisation?

Answer 5

the enthaply change when a mole of gaseous atoms is formed from elemetns in their standard states (298k, 1` atm)

Question 6

what is the 1st ionisation energy

Answer 6

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

Question 7

what is the 2nd ionisation energy?

Answer 7

the amount of energy required to remove one electron from every ion in one mole of gaseous 1+ ions to form a mole of gaseous 2+ ions

Question 8

what is the standard enthaply change of formation?

Answer 8

the enthaply chagne when a mole of a compound is formed from its elements in thier standard states, under standard condition (1atm, 298k)

Question 9

what is first electron affinity

Answer 9

the enthalpy change that takes place when one electrons is added to each atom is one mole of gaseous atoms to form one mole of gaseous 1- ions.

Question 10

what is the second electron affintiy?

Answer 10

the enthalpy change that takes place when one electrons is added to each ion is one mole of gaseous 1- ions to form one mole of gaseous 2- ions.

Question 11

what to remember when there is a second electron affinity?

Answer 11

the second electron affintiy must contain an electron

Question 12

waht does lattice enthaply equal to?

Answer 12

enthaply change of formation - everythign elese

Question 13

what is the standard enthaply change of solution?

Answer 13

the enthaply change when a mole of an ionic solid compound is completely dissolved in water under standard conditions (298k, 1 atm)

Question 14

what type of reaction is more soluble?

Answer 14

exothermic means more soluble

Question 15

what is the standard enthaply change of hydration?

Answer 15

The exotrhermic enthaplky change when a mole of isolated gaseous ions is dissolved in water to from a mole of aquesous ions under standard condition (298k, 1 atm)

Question 16

what does a born haber cycle with solution and hydration look like?

Answer 16

Question 17

what is entropy?

Answer 17

a measure of the dispersal of ernergy in a system which is greater, the more disordered a system

Question 18

States from least to most entropy

Answer 18

solid

liquid

solutions

gases

Question 19

what has a higher entropy, 2 or 4 moles of gas?

Answer 19

4 moles of gas

Question 20

how to calculate the entropy?

Answer 20

entropy of products - entropy of reactatns

Question 21

how to calculate entropy?

Answer 21

entropy of products - entropy of reactatns

Question 22

what is the gibbs free energy equation

Answer 22

Question 23

when is a reaction spontaneous/feasable?

Answer 23

when ΔGis -ve

Question 24

what does a normal born hber cycle look like?

Answer 24

Question 25

what does successive electron affinities look like?

Answer 25

Question 26

what are the lattice enthaply routes?

Answer 26