Liquids and Solids

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Date of Experiment October 7, 2012

Report Submitted: October 7, 2012
Title: Liquids and Solids
Purpose: The purpose of this experiment is to determine the boiling point of liquids and the melting point of solids.
Procedure: I got all of my materials together and set up. I poured rubbing alcohol in a beaker and rubber banded it with the thermometer. I logged the last bubble that came out of the capillary tubes. After that I crushed the acetamide and carefully put it in the capillary tube I rubber banded it to the thermometer and logged when the acetamide melted.

Data Table: Observations

Trail 1
Trail 2
Trail 3
Average

Rubbing Alcohol boiling point ‘C
82
83
82
82.33

Acetamide Melting point ‘C
81
81
82
81.33

Questions:
A. Why is it useful to know the melting point and/or boiling point of a substance? *It is useful for you to know the boiling and melting point of a substance so that you can know if the substance is a pure form or if it has any additional chemicals added to it. B. How would you determine the melting of a substance whose melting point is higher than 100°C?

*Another substance other than water in the beaker would have to be used to see melting point that would be higher than 100 ⁰ C such as glycerol or silicon oil. C. What would be the effect of increasing the amount of crystals in the capillary tube? *There would be no difference if the amount of crystals were in the capillary tube because the melting point is still at the same temperature.

D. List sources of error and explain how they would affect your end results. *My sources of error were not logging the temperature at the exact time that the last bubble came out and the exact time the chemical melted. That affected my ended results by being slightly off then what the actual melting point of boiling point actually were.

Conclusion: In conclusion today I learned how to determine the melting point of a substance and how to determine the boiling point of a liquid...
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