A MIXTURE CONSISTS OF TWO OR MORE PURE SUBSTANCES. VARIOUS TERMS ARE USED WHEN DESCRIBING MIXTURES HOMOGENEOUS: USED TO DESCRIBE SUBSTANCES THAT LOOK THE SAME THROUGHOUT. HOMOGENEOUS SUBSTANCES HAVE ONE PHASE AND UNIFORM COMPOSITION. HETEROGENEOUS: USED TO DESCRIBE SUBSTANCES IN WHICH YOU CAN SEE MORE THAN ONE COLOR OR TYPE OF MATTER. HETEROGENEOUS SUBSTANCES HAVE MORE THAN ONE PHASE AND A NONUNIFORM COMPOSITION. PHASE: IS A VISIBLY DISTINCT PORTION OF MATTER TYNDALL EFFECT: IS SEEN WHEN A MIXTURE MAKES A BEAM OF LIGHT VISIBLE. THERE ARE SEVERAL TYPES OF MIXTURES. THEY ARE: SOLUTIONS SUSPENSIONS EMULSIONS COLLOIDAL DISPERSIONS SOLUTIONS: ARE MIXTURES MADE BY MIXING A SOLUTE AND A SOLVENT. THE SOLUTE IS THE SUBSTANCE THAT DISSOLVES. THE SOLVENT IS THE SUBSTANCE THAT DOES THE DISSOLVING. SOLUTIONS ARE HOMOGENEOUS AND DO NOT SHOW THE TYNDALL EFFECT. (HELP WITH SOLUTE AND SOLVENT) SUSPENSIONS: ARE HETEROGENEOUS MIXTURES OF A SOLID AND A LIQUID IN WHICH THE SOLID DOES NOT DISSOLVE. SUSPENSIONS WILL SETTLE WHEN LEFT STANDING UNDISTURBED. SUSPENSIONS WILL SHOW THE TYNDALL EFFECT. EMULSIONS: ARE A SPECIAL TYPE OF SUSPENSION. THIS MIXTURE CONSISTS OF TWO LIQUIDS THAT DO NOT MIX. SINCE THE LIQUIDS DO NOT MIX, EMULSIONS ARE HETEROGENEOUS. EMULSIONS WILL SETTLE INTO LAYERS WHEN THEY ARE LEFT STANDING UNDISTURBED. EMULSIONS WILL SHOW THE TYNDALL EFFECT. COLLOIDAL DISPERSIONS: ARE MIXTURES WITH CHARACTERISTICS PART WAY BETWEEN A SOLUTION AND A SUSPENSION. COLLOIDAL DISPERSIONS MAY APPEAR HOMOGENEOUS BUT ARE ACTUALLY HETEROGENEOUS. COLLOIDAL DISPERSIONS DO NOT SETTLE WHEN LEFT STANDING UNDISTURBED FOR A PERIOD OF TIME. COLLOIDAL DISPERSIONS DO SHOW THE TYNDALL EFFECT.
Posted on: Tue, 16 Sep 2014 01:21:33 +0000
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