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Pure Subs ta nc e sElements - simplest pure substances made of only one type of atom (Periodic Table)
He te ro g e ne o us Mix ture sSubstances can be easily distinguished and separatedEx: sand and salt, iron and sugar, sand and gravel
So lutio nsSolute dissolves in solvent to form solution.Concentrated solution contains more solute than dilute solution.Ex: Kool-Aid, iced tea, coffee
Exte ns ive Pro p e rtie sDepend on sample sizeSpecific to a single objectEx: length, mass, diameter
Inte ns ive Pro p e rtie sDo not depend on sample sizeUsed to identify types of matterAll physical and chemical properties are intensive
Phys ic a l Pro p e rtie sDescribe substances undergoing physical changesEx: density, color, texture, conductivity, malleability, ductility, boiling point, melting point
Che m ic a l Pro p e rtie sDescribe substances undergoing chemical changesEx: flammability, corrosiveness, volatility
Phys ic a l Cha ng e sSame substance remains after changeUsed to separate mixturesEx: pounding, tearing, cutting, dissolving, evaporating, melting, boiling, pulling
Che m ic a l Cha ng e sResults in new substance with new propertiesAlso known as a chemical reactionEx: burning, digesting, fermenting, decomposing
Che m ic a l Cha ng e Evid e nc e1. Precipitate forms (solid)2. Gas evolves (bubbles)3. Color change4. Energy change
• Exothermic = releases energy• Endothermic = absorbs energy
5. Odor produced (sometimes)
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