Dissolving

Question 1

What is the rule for dissolving?

Answer 1

Like dissolves like

Question 2

What do polar molecules dissolve in?

Answer 2

Polar solvents

Question 3

What do non-polar molecules dissolve in?

Answer 3

Non-polar solvents

Question 4

Can polar molecules dissolve in non-polar solvents, or vice versa?

Answer 4

No, because of the rule ‘like dissolves like’

Question 5

Do ionic compounds dissolve in polar solvents?

Answer 5

Yes

Question 6

What happens between a polar solute and a polar solvent?

Answer 6

• There is a stronger intermolecular attraction than intramolecular attraction
• The solvent pulls the polar molecules of the solute apart, so it dissolves

Question 7

What happens between a non-polar solute and a non-polar solvent?

Answer 7

• There is a stronger intermolecular attraction than intramolecular attraction
• The solvent pulls apart the non-polar molecules, so it dissolves

Question 8

What happens between a non-polar solute and a polar solvent?

Answer 8

• There is a stronger intramolecular attraction than intermolecular attraction
• The solvent cannot pull apart the non-polar molecules, so it doesn’t dissolve

Question 9

How does water dissolve solutes?

Answer 9

• Water molecules surround the atoms in the solute by aligning itself in such a way that the opposite charges are drawn to each other (eg, negative O to a positive Na)
• Larger numbers of molecules also align themselves, if necessary, so that there is a sufficiently strong attractive force to break the bonds of the solute

Question 10

What happens after a solute dissolves in water?

Answer 10

• After the particles are separated, they diffuse into the solvent and are surrounded by solvent molecules
• New attractive forces are formed