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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