Biology Chapter 6.3 Mixtures

Mixtures Two or more substances combined Are physical changes, chemical properties do not change as in forming compounds

Mixtures Some mixtures in the body are: Blood Sweat Saliva Tears Cytoplasm

Mixtures Can be separated by filtering or other physical means (evaporating of the water) Can be homogenous (same all over, 14kt gold) or heterogenous (parts are different, marble)

Types of Mixtures Solutions Are homogenous Can’t see separate parts One substance (solute) is dissolved into another (solvent) Can’t be separated by filtering

Types of Mixtures Solutions Can be a gas – air Can be a liquid – gasoline Can be a solid – penny Which is the solvent, which is the solute? Kool-Aid, Iced-Tea, Salt Water, Used Paint Thinner

Types of Mixtures Are heterogeneous Can see separate parts Suspensions Are heterogeneous Can see separate parts Not all the parts are dissolved Denser parts settle out to bottom Blood, river water, paint (that needs to be mixed)

Types of Mixtures Colloids Are homogenous Can’t see separate parts Are large molecule “solutions” Sol = Liquid at room temperature Gel = Solid at room temperature

Types of Mixtures Colloids Are these sols or gels? Jello Milk Fingernail polish (on and off nails) Toothpaste Orange Juice (with and without pulp) Hair goop