Classifying Matter.

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Presentation transcript:

Classifying Matter

Matter Pure Substance -definite composition -cannot be physically separated Element -one type of atom Compound -two or more types of atoms chemically bonded Mixture -two or more varying parts -can be physically separated Homogeneous -evenly distributed -uniform properties Solution -very small particles -light passes through Heterogeneous -unevenly distributed -varying composition Suspension -large visible particles -particles settle out -blocks light Colloid -unevenly suspended particles -shows a visible beam of light (positive Tyndall Effect)

How do you classify matter? If it is a pure substance: There is a fixed composition There is a chemical formula If it is a mixture: There is a varying composition It is combined physically It can be separated physically

How do you know if something is an element? The chemical formula shows only one type of atom How do you know if something is a compound? The chemical formula shows two or more elements combined

Homogeneous OR Heterogeneous? Homogenous mixture – composition of the mixture is the same throughout. Examples: soda, KoolAid Heterogeneous mixture – composition is unevenly distributed throughout. Examples: cookie dough ice cream, iron filings in sand

Tyndall Effect Scattering of light beam caused by the reflection from suspended particle If the light passes through the mixture with no visible beam, then the mixture is a SOLUTION If a mixture settles out and blocks the light, then it is a SUSPENSION If a mixture does not settle and shows a beam of light through it (positive tyndall effect), then it is a COLLOID

How do you know if it is a Solution? Uniformly Mixed One substance is dissolved in another solute: part of the mixture that gets dissolved solvent: part of the mixture that does the dissolving Tyndall Effect:

How do you know if it is a Suspension? Particles settle out Tyndall Effect:

How do you know if it is a Colloid? Particles unevenly distributed throughout Shows a beam of light Tyndall Effect:

Hom/Het? Soln/Susp/Coll? Fog ____________ ___________ Paint ____________ _________ Syrup ____________ ___________ Colloid: yogurt

Particle View of Matter

Draw particles on note sheet.

Examples