Melting point

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    experiment one, are determining the melting points of different crystalline substances following a specific procedure. By finding the melting point of a crystalline substance, it helps determine what kind of compound it is as well as initiate the purity. A DigiMelt apparatus can be used to determine the melting point where a small amount of the the substance is packed into a capillary tube and heated slowly in the apparatus which includes a thermometer, a heating coil and a magnifying eyepiece for observing the substance. The two temperatures that need to be noted down is the first point at which liquid is formed on the crystalline substance, and second the point at which the crystalline substance turn into a clear liquid. These two…

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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…

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    Post-lab: Recrystallization of benzoic acid Calculations: I initially poured 1.10 grams of impure acid into my flask. After the experiment was done, I had 0.54 grams of pure benzoic acid. This gives a difference of 1.10-0.54=0.56 g and a percentage of (0.54/1.10)*100=49.09% The true melting point of pure benzoic acid is 122.41°C and I received 126.9°C as my melting point. This gives a difference of 126.9°C-122.41°C=4.49°C and a percentage of (122.41/126.9)*100=96.46% Results: Impure benzoic…

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    Tartarin Melting Point

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    Abstract: The melting point ranges for the substances Tartaric Acid, Acetaminophen, and Phenacetin, which are in powder form and white in color, was found and compared to their literature values to find their purity. The melting point range of a 9:1 mixture of Phenacetin and Tartaric acid was later found to show the effect an impure substance has on temperature. Melting point range for unknown three that was lastly tested was matched to Acetaminophen by comparing their melting points.…

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    E-Stilbene

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    The melting point is the temperature at which a solid precipitate changes into its liquid form upon heating. It also helps when determine which isomers predominate. The experimental melting point of the E-stilbene was 242 degrees Celsius. The actual melting point of the E-stilbene was 241 degrees Celsius. This verifies that the predominating isomer is meso indicating that the cyclic intermediate remained. Therefore, almost no error occurred within the reaction since the two melting points are…

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    Melts Ice Fastest

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    What do you think melts ice fastest? What makes black ice melt the fastest? This question is very important, because it best asks how to melt ice fast. It is important to melt ice fast because 60% of car crashes are caused by black ice, so it is important people melt this black ice. Based on research, the heater will melt ice the fastest. The three topics being researched in this essay are, What is the freezing point of water? What is the temperature of your hand? Is ice dense or light? Why…

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    Freezing Ice Chemistry

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    freezing point and salt. Like what is freezing point and what does this affects. Also what would happen if you put salt in ice water if there is a effect to the ice and water. This paper will give background about basic chemistry of salt. Also it will give you some background on ice cream. How ice could effect ice cream. Water has the freezing point of 0 degrees Celsius. If you put a ice cube in water the rate of freezing and melting aren't changing. If you add something to that mixture of ice…

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    Sucrose Results

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    Conclusion: After observing the evidence that we received from this experiment it is clear that the results thoroughly support my hypothesis. Within my hypothesis I had stated that the melting order from first to last was, as follows, paraffin, glucose, sucrose, and finally, salt. The results that we gathered supported this exact hypothesis. The first substance to melt was indeed paraffin and the second was glucose, and then sucrose and finally salt. The results are supported by the basic…

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    Diels Alder Reaction Lab

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    The next thing that was found was the percent yield which is equal to the actual yield over the theoretical yield times 100. Since the theoretical yield was 0.00056M, the result was a 34% yield. The melting point was found to be 262.7 oC, which lies within the correct range theoretically. The results of the TLC plate testing also concluded that the product was pure. The spot from the product appeared half way up the card while the anthracene was at the top and the maleic anhydride was at the…

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    Melting Point Value

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    A important tests were performed on the product to pressure the results: melting point value, percent yield, IR, and TLC. The experimental melting point value was found to be a range of 165-167 ºC being a little lower than the literature value for camphor, the intended product, was 175 ºC. The sharp range was resulted in a slightly pure product. The percent yield was lower than expected which can be the reason most of the product was lost during the extraction and almost completely sublimated…

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