Unit 1: Measurement & Matter Separating Mixtures Unit 1: Measurement & Matter

Review: Mixtures elements compounds homogeneous heterogeneous physical Two or more ________________ or _________________ NOT chemically combined. No reaction between substances. Mixtures can be uniform (called ________________________) and are known as solutions. Mixtures can also be non-uniform (called ________________________). • Mixtures can be separated into their components by ________________ means. • The properties of a mixture are similar to the properties of its ________________ . compounds homogeneous heterogeneous physical components

Key Question How can mixtures be separated? Differences in physical properties can be used to separate mixtures. According to your book, what are some methods are used to separate mixtures? Filtration Distillation

Filtration Describe how this works Solid particles are separated from a liquid in a heterogeneous mixture What physical property is used to separate the mixture? Size of particles

Distillation Describe how this works In a homogeneous mixture, a liquid substance (usually water) is separated from substances dissolved in it through boiling What physical property is used to separate the mixture? Boiling point

What’s the Difference? When would you use filtration versus distillation to separate a mixture? Filtration - heterogeneous mixture of solid in liquid Distillation - homogeneous mixture of substance(s) dissolved in liquid

Watch Glass Evaporation Describe how this works Particles are separated from a liquid in a mixture What physical property is used to separate the mixture? Boiling point // evaporation

Crucible Evaporation Describe how this works Particles are separated from a liquid in a mixture What physical property is used to separate the mixture? Boiling point // evaporation

Chromatography Describe how this works Particles in a mixture are separated as they are carried up the chromatography paper by the solvent What physical property is used to separate the mixture? Particle size Solubility

Chromatography http://www.moe.gov.sg/edumall/tl/digital_resources/chemistry/images/paper_chromatography.jpg

What Would You Do? How could you separate a mixture of sand and table salt?

Add water to the mixture to dissolve the table salt. Filter the mixture to remove the sand. Evaporate the mixture to remove the water.

Homework HW 1.12 - Read p. 49-50 by Tues. 9/23/14 Elements Quiz on Wed. 9/24!