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Lecture Comments (3)

2 answers

Last reply by: Nagasrinivas Tripuraneni
Tue May 12, 2015 8:06 AM

Post by Nagasrinivas Tripuraneni on May 11, 2015

Professor, can you explain about flash point ?

Introduction to Melting Points

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Definition of a Melting Point (mp) 0:04
    • Definition of a Melting Point (mp)
    • Solid Samples Melt Gradually
    • Recording Range of Melting Temperature
  • Melting Point Theory 3:14
    • Melting Point Theory
  • Effects of Impurities on a Melting Point 3:57
    • Effects of Impurities on a Melting Point
    • Special Exception: Eutectic Mixtures
    • Freezing Point Depression by Solutes
  • Melting Point Uses 6:19
    • Solid Compound
    • Determine Purity of a Sample
    • Identify an Unknown Solid
  • Recording a Melting Point 9:03
    • Pack 1-3 mm of Dry Powder in MP Tube
    • Slowly Heat Sample
    • Record Temperature at First Sign of Melting
    • Record Temperature When Last Crystal Disappears
    • Discard MP Tube in Glass Waste
    • Determine Approximate MP
  • Tips, Tricks and Warnings 12:28
    • Use Small, Tightly Packed Sample
    • Be Sure MP Apparatus is Cool
    • Never Reuse a MP Tube
    • Sample May Decompose
    • If Pure Melting Point (MP) Doesn't Match Literature