CHEMISTRY SEPTEMBER 23, 2014 Pure Substance vs. Mixture

SCIENCE STARTER You have 3 minutes Work silently and individually

NON-NEGOTIABLE ONE SPEAKER – EVERYONE ELSE ACTIVELY LISTEN REMAIN IN YOUR SEAT FOLLOW ALL DIRECTION

CONSEQUENCES VERBAL WARNINGS – 5 POINTS OFF CALL HOME DETENTION SLIP FROM THE DEAN/AP

OBJECTIVE SWBAT – Identify the difference between a pure substance and a mixture by providing examples. – Identify the difference between a homogenous mixture and a heterogeneous mixture. – Use a particle diagram to illustrate the difference between a pure substance and a mixture.

AGENDA – Science Starter – Review of Pure Substance and Mixture – Identify the Separation techniques – Activity

PURE SUBSTANCE 2 types: – Element – Compound

QUIZ MAKEUP Next Wednesday – Quiz Makeup 4 th period or 9 th period (up until 4:15PM)

PURE SUBSTANCE Have constant composition and constant properties

ELEMENT

COMPOUNDS Examples: – Carbon dioxide = CO 2 – Sodium Chloride= NaCl – Ammonia = NH 3 – Methane = CH 4 – Hydrochloric Acid = HCl

MIXTURE Two types: – Homogeneous – Heterogeneous

MIXTURES Have varied composition and properties

PARTICLE DIAGRAMS A method by which a box with colorful balls are drawn to represent atoms or molecules.

PARTICLE DIAGRAMS - ELEMENTS

PARTICLE DIAGRAMS - COMPOUND

PARTICLE DIAGRAMS - HOMOGENEOUS

PARTICLE DIAGRAMS - HETEROGENEOUS

SEPARATION TECHNIQUES Chromatography Filtration Evaporation Distillation Magnetism

CHROMATOGRAPHY One type is called Paper Chromatography – Usually used to identify chemicals (coloring agents)

CHROMATOGRAPHY

FILTRATION Method for separating an insoluble solid from a liquid – Popularly used in water treatment

FILTRATION

EVAPORATION Method used to separating a homogeneous (solution) mixture of a soluble solid and a solvent Involves heating the solution until the solvent evaporates – Examples: water and sugar solution – Heat the solution until the water (solvent) dissolve leaving behind the sugar

EVAPORATION

DISTILLATION Method used to separate a liquid from a solution Similar to evaporation but the vapor is collected by condensation

DISTILLATION

MAGNETISM Method used to separate two solids with one having magnetic properties

MAGNETISM

SEPARATING FUNNEL Method for separating two immiscible liquids (liquids that do not dissolve well) – Oil and water

SEPARATING FUNNEL

Activity – Extra Points 1. Draw the Chromatography Experiment – Also include a description of what you did – 5 points 2. Draw the Filtration Experiment – Also include a description of what you did – 5 points