II

III

I I. Types of Mixtures

(p. 476 – 479)

I. Types of Mixtures

(p. 476 – 479)

Ch. 15 – Mixtures & SolutionsCh. 15 – Mixtures & Solutions

A. DefinitionsA. Definitions

Mixture = Variable combination of 2 or more pure substances

Homogeneous = uniform composition throughout Heterogeneous = variable composition

Heterogeneous Homogeneous

A. DefinitionsA. Definitions

Solution – Solution – homogeneous mixture

Solvent Solvent – dissolves the solute

Solute Solute – substance being dissolved

B. MixturesB. Mixtures

Gases can also mix with liquids Gases are usually dissolved in

water Examples are carbonated drinks

• Homogeneous mixtures (solutions)

• Contain sugar, flavorings and carbon dioxide dissolved in water

B. MixturesB. Mixtures

Solution• homogeneous• very small particles –

avg diameter usually less than 2 nm (10-9 m)

• no Tyndall effect• particles don’t settle• Ex: rubbing alcohol

Tyndall Effect

B. MixturesB. Mixtures

Colloid• heterogeneous• medium-sized particles, usually between 2 nm and

1000 nm• Tyndall effect• particles don’t settle• Ex: milk

B. MixturesB. Mixtures

Suspension• Heterogeneous• large particles usually

> 1000nm• particles settle• Tyndall effect• Ex: fresh-squeezed

lemonade

B. MixturesB. Mixtures

Examples:

• mayonnaise

• muddy water

• fog

• saltwater

• Italian salad dressing

colloid

suspension

colloid

true solution

suspension

Mixtures Mini-LabMixtures Mini-Lab

Have fun! 20 minutes…