Oceans 1: Dissolving ( Ionic Compounds )

Question 1

Bendo Mex

Answer 1

Breaking bonds is ENDOthermic

Making bonds is EXOthermic

Question 2

Describe conditions required ( in terms of bonding ) for a substance to dissolve

Answer 2

To dissolve bonds formed have to be stronger than bonds broken ( = EXOthermic )

Question 3

What kind of solvents do ionic substance tend to dissolve in

Answer 3

Polar solvent = ion dipole bonds are formed

Question 4

Describe the below process of dissolving in terms of bonds:

Ionic compound + water —> solution

Answer 4

Breaking ionic bonds + breaking hydrogen bonds —-> making strong ion-dipole bonds

Question 5

Describe when dissolving will and will not occur in terms of enthalpy change of solution

Answer 5

• Delta H sol = EXOthermic = dissolving will occur

- Delta H sol = slightly ENDOthermic = dissolving may occur