10/13 notes

Question 1

what factors influence lattice energy

Answer 1

1)change of the ions dominance effect
2)size of the ions (distance between ions)

Question 2

what does higher charge mean about lattice energy

Answer 2

larger lattice energy (stronger ionic bonds)

Question 3

how do smaller sized ions and shorter bond lengths influence lattice energy

Answer 3

larger lattice energy

Question 4

what is the overall formula of ionic compound

Answer 4

overall neutral

Question 5

what is occasionally trapped in the lattice

Answer 5

water

Question 6

what are four properties of ionic compounds

Answer 6

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

Question 7

what do you need more of to conduct electricity

Answer 7

mobile charged particles

Question 8

what does brittle mean

Answer 8

not malleable/ductile, cant bend it

Question 9

are ionic bonds strong

Answer 9

yes

Question 10

what happens to the lattice shape when it starts to dissolve in water

Answer 10

corner pieces are pulled off

Question 11

definition of lattice energy

Answer 11

the energy required to convert one mole of an ionic solid into gaseous ionic constituents.

Question 12

when will lattice energies take positive values

Answer 12

with endothermic reactions

Question 13

when will lattice energies take negative values

Answer 13

with exothermic reactions

Question 14

endothermic

Answer 14

absorb heat