4 MIXTURE BASICSMixtures are usually how you find things in nature. Rocks, the ocean, just about anything you find.They are substances held together by PHYSICAL FORCES, not chemical.
5 Properties of Mixtures Substances do not chemically combinedSubstances may change in physical appearance (but not chemical comp.)Substances can be present in any amount
6 Tap water is a mixture of water with other dissolved substances Tap water is a mixture of water with other dissolved substances. Distilled water is a pure substance.
7 MIXTURES: a physical blend of two or more pure substances Homogeneous A mixture with a completely uniform distribution. Only one phase of matter is apparent. Heterogeneous A mixture of variable, non-uniform distribution. Two visible phases of matter present.
8 Appear to be the same throughout Examples:GlassAirMetalHomogeneous MixturesAppear to be the same throughoutDo not separate out
9 Heterogeneous Mixtures Separate & settle out easily Examples:Oil & vinegarSand in waterGraniteHeterogeneous MixturesSeparate & settle out easily
10 Colloids a homogeneous mixture Particles are mixed but not dissolvedParticles are kept suspendedCloudy appearance b/c particles are hitting each & keeping them from settling outExamples = milk, toothpaste, whipped cream
11 Solutions type of homogeneous mixture of 2 or more substances in a single physical state Best mixed of all the mixturesExamples = salt water, air, antifreeze, powdered Tang, tea, or lemonade in waterOne substance that dissolves = the SOLUTEOne substance that does the dissolving = the SOLVENT
12 Properties of Solutions Universal solvent = waterParticles are smallParticles cannot be separated by simple physical meansEvery part of a solution tastes the sameThus, particles are evenly distributed (spread out)
13 SOLUTIONS: homogeneous mixtures solid in solid (sand)solid in liquid (muddy water or blood)solid in gas (smoke)liquid in liquid (oil in water)liquid in gas (air freshener)gas in liquid (bubbles)gas in gas (air)
14 Solubility Soluble = a substance that dissolves Insoluble = a substance that does not dissolveThe ability of the solvent to dissolve the solute at a specific temperature = solubilityIncrease temperature increase solubility