lattice enthalpy

Question 1

why is first electron affinity exothermic

Answer 1

Energy is released when nucleus attracts additional electron
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energy absorbed to overcome electron repulsion

Question 2

first electron affinity

Answer 2

the enthalpy change that occurs when 1 mol of gaseous atoms each aquire 1 electron to form 1 mol of gaseous 1- ions.

Question 3

enthalpy of hydration

Answer 3

the enthalpy change that occurs when 1 mol of gaseous ions is dossolved in water to form 1 mol of aqueous ions.

Question 4

is enthalpy if hydration endothermic or exothermic- why?

Answer 4

exothermic- as water molecules surround ions, ion- dipole interactions form and release energy

Question 5

what affects enthalpy of solution

Answer 5

the higher charge density allows the formation of stronger ionic bonds within a lattice as well as stronger ion–dipole bonds in aqueous solution.

Question 6

why is energy releasd when bonds form?

Answer 6

because atoms become more stable.