2 What is a mixture?When two or more materials or substances are mixed together but do not chemically combine.This means they retain their original properties.This means they can be separated by physical means.
3 What are some different ways of separating mixtures? MagnetismHand separationSifting or sievingDecantFiltrationDistillationEvaporationChromatography
4 MagnetismIf one component of the mixture has magnetic properties, you could use a magnet to separate the mixture. Iron, nickel, and cobalt are all materials that are magnetic.Not all metals are magnetic: gold, silver, and aluminum are examples of metals that are not magnetic.
5 Example of magnetismUsing a magnet to separate nails from nonmagnetic substances
6 Hand separation Separating the parts of a mixture by hand. Only useful when the particles are large enough to be seen clearly.
7 Example of hand separation: Using your fork to separate tomatoes, lettuce, cucumber, onions, etc. in your salad.
8 Sifting or sievingUsed to separate a dry mixture which contains substances of different sizes by passing it through a sieve, a device containing tiny holes.
9 Example of sifting/sieving: Using a sieve to separate sand from pebbles.
13 Filtration separates a liquid from a solid Mixture ofsolid andliquidStirringrodFiltrate (liquidcomponentof the mixture)Filter papertraps solidFunnelFiltration separates a liquid from a solidZumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 40
14 Example of filtration: Using a coffee filter to separate the coffee flavor from the coffee beans.
16 DistillationWater VapourMixture (salt and water)Bunsen burnerWater
17 Distillation is a process of boiling a liquid and condensing and collecting the vapor. The liquid collected is the distillate.The usual purpose of distillation is purification or separation of the components of a mixture. This is possible because the composition of the vapor is usually different from that of liquid mixture from which it is obtained.
18 The solution is boiled and steam is driven off. Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 39
19 Salt remains after all water is boiled off. Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 39