10/13 notes Flashcards
what factors influence lattice energy
1)change of the ions dominance effect
2)size of the ions (distance between ions)
what does higher charge mean about lattice energy
larger lattice energy (stronger ionic bonds)
how do smaller sized ions and shorter bond lengths influence lattice energy
larger lattice energy
what is the overall formula of ionic compound
overall neutral
what is occasionally trapped in the lattice
water
what are four properties of ionic compounds
1)solids at room temp and pressure
2)brittle
3)dissolve in water or polar solvent
4)does not conduct electricity as solid, just liquid
what do you need more of to conduct electricity
mobile charged particles
what does brittle mean
not malleable/ductile, cant bend it
are ionic bonds strong
yes
what happens to the lattice shape when it starts to dissolve in water
corner pieces are pulled off
definition of lattice energy
the energy required to convert one mole of an ionic solid into gaseous ionic constituents.
when will lattice energies take positive values
with endothermic reactions
when will lattice energies take negative values
with exothermic reactions
endothermic
absorb heat