Lecture 1 - Melting Points - Prior to First Day of Lab Read...

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Prior to First Day of Lab Read in syllabus (pp. 21-44) or on website: Check-In Laboratory Safety Waste Disposal Ventilated Work Stations On the first day of lab (Wednesday): Bring COURSE SYLLABUS and all protective equipment . Bring breakage/usage card . Check in and complete/sign Safety Device Location Worksheet (p. 35) Assignment 1 – Getting Started 20 points, 40 questions – safety, basic lab review Assignment 1 – Getting Started Before start time on check-in day! Make a note of this for yourself.
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Physical Constants: Melting Points The temperature at which the liquid and solid phases of a substance exist in equilibrium with one another without a change in temperature is called its melting point . Expressed as a temperature range CORRECT: 108-110 o C. INCORRECT: 109 o C. s o l i d q u temperature Phase change Heat conducts phase change; temperature of material remains stable Physical Constants
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Pure vs. Impure Compounds Pure compounds usually melt over a narrow temperature range, often 1 o or less. Impure compounds melt at lower temperatures than their pure counterparts and over a wider temperature range . Addition of impurities to a previously-pure substance results in a MP for the mixture that is lower than that of the pure substance.
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This note was uploaded on 09/14/2009 for the course CHEM 233 taught by Professor Miller during the Winter '08 term at University of Illinois at Urbana–Champaign.

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Lecture 1 - Melting Points - Prior to First Day of Lab Read...

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