The Melting Point Of A Substance Essay

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The melting point of a substance is best described as the temperature at which a solid becomes a liquid (Bruice 2014). On the molecular level, when a compound melts the forces between the molecules become weaker. This is because when a substances heats up the kinetic energy between the molecules increase causing the molecules to vibrate. When the vibrations become strong enough for the molecules to move around and pass other molecules, the compound that is being heated up starts to melt and become a liquid. In this lab, five different ratios of two chemical solids, Urea and trans¬-cinnamic acid, were heated up in a Mel Temp apparatus until the final melting point was achieved. Each substance started as a solid in a capillary tube and when they reached the staring melting temperature, parts of the solid began to breakdown. The solid substance continued to breakdown until it reached it final melting temperature, a state in which the substance turned into a clear liquid with no sign of any solid in the tube.
The melting point for the sold pure urea is 132.70˚C and the melting point of solid trans-cinnamic acid is 133˚C (Lewis 1997). From the experiment, it was determined that pure urea had a melting point of 131.2 ˚C -136.6 ˚C which falls within range of the normal melting temperature of pure urea, meaning that error occurred. Trans-cinnamic acids melting point was determined to be 133.4 ˚C -135 ˚C, which falls out of the normal melting tempature by 0.4 ˚C meaning that…

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