Dissolving and Disassociation

Question 1

What is the P.E.E.L method?

Answer 1

P - Point
E - Explanation
E - Evidence/Example
L - Link

Question 2

Why might a compound be insoluble?

Answer 2

○ When the ionic bonds in an ionic substance are very strong,
○ solvent particles will be unable to separate the ions of a solute.
○ As a result, the solute will be insoluble (in the solvent)

Question 3

What happens when ionic substances dissolve in water?

Answer 3

○ The ions of the ionic substance dissociate from each

other, as the ionic substance dissolves

Question 4

What does Disassociate mean?

Answer 4

When a molecule/formula unit separates into smaller…

○ atoms
○ ions
○ molecules

Question 5

a) For ammonium sulfide, write the chemical formula for this substance.
b) Write the ionic formula for this substance

Answer 5

a) (NH4)2S

b) 2NH4 + (aq) + S 2- (aq)

Question 6

Which compounds are usually soluble? Insoluble?

Answer 6

Soluble:

• Any substance bonded with a Group 1 metal
• All nitrates are soluble

Question 6

Which compounds are usually soluble? Insoluble?

Answer 6

Soluble:

• Any substance bonded with a Group 1 metal
• All nitrates are soluble