Matter – General Information Chem328 1 st Year Chemistry Revised 2015

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Matter General InformationChem328 1st Year ChemistryRevised 2015A. Matter FlowchartMATTERHomogeneous Mixture(solution)Heterogeneous MixtureCompoundElementMIXTURE More than One Base unit or Particle Type

PURE SUBSTANCE- ONE BASE UNIT OR PARTICLE TYPEA. Matter FlowchartExamples:graphitepeppersugar (sucrose)paintsodaelementhetero. mixturecompoundhetero. mixtureSolution (homo. mixture)B. Pure SubstancesElement composed of identical atomsEX: copper wire, aluminum foil

B. Pure SubstancesCompoundDef: 2 or more elements chemically combined in a fixed mass ratio (also fixed # ratio)properties differ from those of individual elementsEX: table salt (NaCl)

C. MixturesVariable combination of 2 or more pure substances.

HeterogeneousHomogeneousC. MixturesHomogeneous MixtureCalled a SolutionParticles are very small and evenly distributed (affects of this is)No Tyndal Effect (see slide below)Particles dont settle outParticles dont filter outEX: rubbing alcohol

C. MixturesHeterogeneousmedium-sized to large-sized particlesparticles may or may not settleHas Tyndall Effect (see slide below)EX: milk, fresh-squeezed lemonade

Difference Between Types of Heterogenous Mixtures Colloid Dont settle out Ex: Jello Suspension Do settle out Ex: Muddy H2O1 Tyndall EffectWhen particles are aggregated together or themselves are large enough to they affect light passing by.Examples: Colloids and Suspension (solution do not have Tyndall Effect)Picture: Left container is colloid and right container is solution.

C. MixturesExamples:teamuddy waterfogsaltwaterItalian salad dressingAnswers:SolutionHeterogeneousHeterogeneousSolutionHeterogeneous


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