Lab 6 Prelab Spectrophotometry This is due at the beginning of lab 6. Read the lab protocol for this week and type your individual answers to the following questions. Each student should turn in answers at the beginning of class. You may consult other resources (textbook‚ library‚ etc.) Remember to cite information and put responses in your own words to avoid plagiarism (and loss of credit on the assignment). 1. Refer to step 2 in the protocol for lab 6. Calculate the concentration of the sample
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First we added 4.0 mL of pH in each corresponding test tube and then added 0.5 mL of substrate (catechol) into each test tube. In the instructions it says to apply your 0.5 mL of tyrosinase (potato extract) as well but you have to blank the spectrophotometer before. The results from this experiment confirms that our hypothesis of a neutral pH displaying a stronger impact on tyrosinase is true. According to our results the pH levels at a more neutral state showed a greater reaction compared to pH
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strong morals‚ good leadership‚ and determination. Many of Americas’ great leaders are Eagle Scouts. I have learned the value of becoming an Eagle Scout and hope to become a great leader some day as well. When I earned the rank of Eagle in the BSA‚ I fully understood how it could be one of the hardest accomplishments a young man can complete. Only three out of every one hundred boys who begin scouting attain the rank. From learning to follow their leaders to becoming leaders themselves‚ young
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The Influence of the Amount of Light on Photosynthesis and Transmittance “I pledge that no unauthorized assistance has been given or received in the completion of this work. Experiments described were performed by me and/or my lab group and this write-up is entirely my own creative work.” X________________________________________ I. Introduction Photosynthesis is the process that plants use to convert light energy into chemical energy. The reactants of photosynthesis include carbon dioxide
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different measurements for samples. Our sources of error could have included eye measurement error‚ timing of set solutions error‚ measurement errors‚ and small calculation errors. Among other variables‚ the calibration of the analytical balance and spectrophotometer could have been off slightly‚ yet our results‚ like most other groups‚ still followed the general trend line generated by the graph using Beer’s Law. The measurement errors could have occurred due to the fact that one partner’s perspective of
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membrane of the beet root cell‚ the more betacyanin released into the solution which surrounds the beet cells. The intensity of the pigment colour visible to the observer indicates the extent of which the membrane was damaged. In addition‚ a spectrophotometer is used to measure the amount of betacyanin absorbed by its surrounding water solution from the cell’s vacuole containing the pigment. In turn‚ the higher the temperature of the surrounding solution‚ the more damage is done to the cell membrane
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Abstract The abstract‚ although it comes first logistically‚ always should be written last. It needs to be written last because it is the essence of your report‚ drawing information from all of the other sections of the report. It explains why the experiment was performed and what conclusions were drawn from the results obtained. A general guideline for an abstract has five sections or areas of focus: why the experiment was conducted; the problem being addressed; what methods were used to solve
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The natural plant exudate gum tragacanth is obtained from the stem of the bush like plant “goat’s-horn”‚ Astragalus species. Gum tragacanth has been used commercially for well over 2000 years and is currently widely used as a thickener and emulsifier in emulsion systems in different pharmaceutical‚ food‚ cosmetic and diverse industrial uses. In addition‚ it is on the list of stabilizers that are permitted by Food and Agriculture Organization/ World Health Organization that could be used during the
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Phosphoric Acid & Spectrophotometer Determination of the Percentage of Phosphoric Acid‚ in Cola Drinks (Experiment 23 & 24) Robbie Kinsey Partner: Debnil Chowdhury Chem. 1312-D TA’s: Russell Dondero & Sylvester Mosley Performed Feb. 16‚2000 Purpose The objective of this lab was to determine the concentration of phosphoric acid in cola through two different methods: a pH titration and a spectrophotometer method. Procedure
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NADPH. The flow of electron through the electron transport chain can be measured using DCPIP‚ a blue chemical which turns colourless when reduced by electrons at the final step of the electron transport chain. The absorbance was measured using a spectrophotometer at 605nm‚ and the rate of linear decrease in absorbance over time represents the number of electrons flowing through the electron transport chain reflecting the relative rate of photosynthesis. Chloroplasts only absorb certain wavelengths in
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