to be 127 g/mol with a percent error of 94.2%. Possible sources of error inherent to this segment of the experiment were the fact that when the temperature of the solution was being measured‚ the calorimeter was placed near the hotplate by mistake. The heat from the hotplate could have transferred to the calorimeter‚ which would result in an increased temperature. This explains why the percent error for the specific heat capacity was negative. Another source of error is that the hole in the lid of
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is about 53 degrees Celsius (127 Fahrenheit). A melting/freezing point is the equilibrium of a solid to a liquid or a liquid to a solid. Materials: The materials used during this experiment are two beakers‚ three-fourths of tap water in each‚ a hotplate‚ a test tube containing Paradichlorobenzene‚ two thermometers‚ a timer‚ a clamp‚ and a ring stand. Methods/Procedure: The procedure used for this experiment was detailed on the handout entitled ‘’Melting Temperature of a Pure Substance’’. No changes
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Factors Influencing Rate of Reaction Aim To investigate several effects believed to influence rate of reaction‚ concentration of a substance and temperature‚ and observe the effects. Hypothesis Concentration and temperature will both increase the rate of reaction in accordance with collision theory. Introduction The reaction rate or rate of reaction for a reactant or product in any given reaction can be defined as the speed with which a reaction occurs. For example‚ the oxidation of iron
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peroxide and 5 mL of water. Place each tube in each of the following water baths for 10 mins 0 degrees C: 400 mL beaker filled with ice water 23 degrees C: No bath 37 degrees C: Place in bath 70 degrees C: Place in bath 100 degrees C: Obtain hotplate and heat water Add 10 drops of enzyme solution to all test tubes Part c: Place three clean test tubes in a rack and
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Because of this‚ I hypothesized that all of fraction A and most of fraction B consisted of the low boiling point compound. As I raised the temperature of the hotplate‚ I was able to collect fraction C‚ and I predicted that it was composed of mostly the high boiling point liquid. To test this‚ the experiment called for the use of gas chromatography. The chromatography would not only show the relative concentrations
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Experiment 10 – Enzymes Enzymes are proteins that act as catalysts for biological reactions. Enzymes‚ like all catalysts‚ speed up reactions without being used up themselves. They do this by lowering the activation energy of a reaction. All biochemical reactions are catalyzed by enzymes. Since enzymes are proteins‚ they can be denatured in a variety of ways‚ so they are most active under mild conditions. Most enzymes have optimum activity at a neutral pH and at body temperature. Enzymes are
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October 17 & October 24‚ 2012 How is Aspirin Made? This lab is about synthesizing aspirin using a hotplate to heat the reaction. It involved vacuum filtration‚ recrystallization‚ and comparing the properties of aspirin with salicylic aspirin. The first thing we did in this lab was make a hot-water bath by putting a beaker with water on a hot plate. After measuring out 2.1 grams of salicylic acid and 3 ml of acetic anhydride‚ we mixed the two together‚ along with 3 drops of sulfuric acid. We
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Gravimetric Analysis of CA2+ as CaC2O4.H2O Introduction Weight determination represents one of the most accurate and precise form of measurement carried out in lab analysis. Thus‚ gravimetric analysis provides a great assay of a variety of analytes. Mixtures of compounds in difference phases provide us with one of the simplest methods of separation and mass explorations. Separating a solid mass from a liquid involves the commonplace
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In the second separation of this experiment‚ the Erlenmeyer flask with the first filtrate was put into a beaker so the filtrate was in the beaker. The beaker was then heated on a hotplate until near boiling. After the whey protein had precipitated‚ a vacuum filter was used to filter out the whey. These proteins were then air-dried. A qualitative test was done to indicate that the sample extracted was the protein whey. Again‚ a small test tube was used and 2 mL of protein test solution was put in
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The true story tells us of the young woman‚ Celie‚ and her hardships. From a young age she was repeatedly abused by her step-father and was then forced into an abusive marriage‚ jumping out of the fry pan and into the hotplate. Celie is isolated from her sister Nettie and her 2 children; her only support networks and writes to God as a way of overcoming her harsh conditions‚ until Shug Avery enters her life. Shug‚ an outspoken and free woman inspires Celie to rise above
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