Types of Mixtures
What’s the difference at the molecular level?
Pure substance, homogeneous or heterogeneous mixture?
• Kool-aid• Fruit loops cereal• Sugar crystals (C6H12O6)
• Air (O2 + N2)• Pizza• Tea• Copper wire (Cu)• Trail mix• Cake batter
Homogeneous Mixture• Uniform composition• One phase (part of sample
with uniform composition/properties)
• Small particles, evenly distributed
• Examples: – Salt water solution– Iodine– Vinegar– stainless steel (mixture of
iron, chromium, and nickel)
Parts of a Solution
• A liquid (solvent) with a substance (the solute) dissolved in it
• Particles are atoms, molecules, or ions (very small)
Heterogeneous Mixture• Not evenly mixed• More than 1 phase• Particles not
uniformly distributed, larger
• Easily separated physically
• Examples: salt and pepper, cereal, rocks, bag of assorted candy
Colloid: A heterogeneous mixture of intermediate-sized particles that don’t settle out
Examples: fog, whipped cream, mayo, smoke
Suspension• A heterogeneous mixture with BIG particles that settle
out when left undisturbed• Liquids that need to be “shaken well before using”
• Examples: oil and vinegar dressing, muddy water