Thermodynamic

Question 1

what is enthalpy change

Answer 1

heat change at constant pressure

Question 2

what reaction is the first ionisation energy

Answer 2

endothermic

Question 3

first electron affinity

Answer 3

energy change when 1 mole of gaseous atoms gain an electron to form 1 mole of gaseous 1- ions

N (g) + e- -> N-(g)

Question 4

what reaction is the first electron affinity

Answer 4

exothermic

Question 5

second electron affinity

Answer 5

energy change when 1 mole of gaseous 1- ions gain an electron to form 1 mole of gaseous 2- ions

V- (g) + e- -> V2- (g)

Question 6

what reaction is the second electron affinity

Answer 6

endothermic

Question 7

enthalpy of atomisation

Answer 7

enthalpy change when 1 mole of gaseous atoms are formed from an element in its standard state

Na(s) -> Na(g)
1/2 F2(g) -> F (g)

Question 8

what reaction is the enthalpy of atomisation

Answer 8

endothermic

Question 9

lattice enthalpy

Answer 9

enthalpy change when 1 mole of an ionic compound is formed from its constituent gaseous ions

Na+(g) + CL-(g) -> NaCl (s)
Zn2+(g) + 2Br-(g) -> ZnBr2

Question 10

what reaction is the lattice enthalpy

Answer 10

exothermic

Question 11

lattice dissociation enthalpy

Answer 11

enthalpy change when 1 mole of an ionic compound is broken into its constituent gaseous ions

NaCl(s) -> Na+(g) + Cl-(g)

Question 12

what reaction is the lattice disassociation enthalpy

Answer 12

endothermic

Question 13

bond dissociation enthalpy

Answer 13

enthalpy change when 1 mole of covalent bonds is broken in the gaseous state

Cl2 (g) -> 2Cl (g)

Question 14

what reaction is the bond dissociation enthalpy

Answer 14

endothermic