Solutions and Suspensions

Question 1

Formula for solution

Answer 1

Solvent + solute = solution

Example:
Water + salt = salt solution

Question 2

Why do we see more solvent than solute?

Answer 2

Solvent particles surround the solute particles, so the solvent shows more

Question 3

Characteristics of solutions

Answer 3

• homogeneous
• the solute does not separate from the solvent when left to stand
• no residue left after filtration

(3)

Question 4

Examples of solutions

Answer 4

At home:- tea/coffee
- soapy water

Industries:- dyes in fabrics
-oils from plants with alcohol to make perfumes

Question 5

Suspension

Answer 5

Mixture with insoluble particles suspended in a liquid or gas

Question 6

Characteristics of suspensions

Answer 6

• not homogeneous
• solute and solvent separate after being left to stand
• residue left after filtration

Question 7

Homogeneous

Answer 7

Colour, density, physical and chemical properties are the same in the mixture

Question 8

Solubility

Answer 8

Maximum amount of solute

• able to dissolve in
• 100g solvent
• at a given

(3)

Question 9

Saturated solution

Answer 9

Has maximum amount of solvent dissolved at a given temperature

Question 10

Factors that affect solubility

Answer 10

• nature of a solvent: same solutes have different solubilities in different solvents
• nature of a solute: different solutes have different solubilities in same solvents
• temperature: usually more solute dissolves at a higher temperature

(6)

Question 11

Rate of dissolving

Answer 11

How fast a substance dissolves in a fixed volume of solvent

Question 12

Factors that affect rate of dissolving

Answer 12

• temperature (should be high)
• rate of stirring (should be fast)
• size of particles (should be small so that there’s a greater surface area that touching the solvent)