homework 3

•  HOMEWORK: Methods of Separating Mixtures

•  First: Read Chapter 3 sections 3 and 4 (Mixtures of Matter and Elements and Compounds). •  Second: Read this file. •  Third: Exemplify the use of methods of

separating mixtures in: recycling processes, purification of water, air and solids. Before writing your examples, do research and cite your sources. •  DUE DATE: Wednesday 24th, 2011

METHODS OF SEPARATING MIXTURES

August 21st, 2011

Methods of separating mixtures

•  Filtration • Decantation • Distillation •  Paper chromatography • Centrifugation • Magnetization

Filtration

•  Separates a solid from a fluid (liquid or gas) •  Uses a porous barrier: filter paper •  Use gravity or gravity enhanced by a vacuum.

Decantation

•  Used to separate immiscible liquids •  Done by carefully pouring one of the

solutions into another container •  Used to separate insoluble solids

Distillation

•  Mostly used for homogeneous mixtures •  Separates substances by their boiling points •  Condense the gas into a liquid and collect

Paper Chromatography

•  Composed of a mobile phase and a stationary phase •  Mobile phase: usually a gas or a liquid that

travels through the stationary phase •  Stationary phase: chromatography paper

Centrifugation

• Uses the centrifugal force in order to sediment compounds in a mixture.