(1) Answer to Question in lab manual. NO introduction/background etc. 1. What is the retention time for caffeine? Retention time for caffeine : 4.149+4.142+4.152+4.1454 = 4.15 2. What is the retention time for benzoic acid? Retention time for caffeine : 2.651+2.817+2.857+2.9274 = 2.81 3. How are the retention times for caffeine and benzoic acid related to their chemical structure and the nature of the chromatographic
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Discussion: Conclusions: • For both meters it was noted from plots that the difference in pressures are directly related to the rate of discharge. • Coefficient of discharge have a varying value depending on the rate of discharge‚ where in the Venturi meter the value of Cd increase gradually at first with increasing the rate of discharge till a point approaching one‚ then started to descend with further increment in the rate of discharge. • The Coefficient of discharge " Cd
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Stanford prison experiment was originally intended to run for a fortnight. However it lasted only 6 days and was ended earlier than initially planned due to the terrible living conditions and psychological problems that developed as the ‘inmates’ and ‘guards’ interacted.. The experiment was run by Philip Zimbardo‚ Craig Haney‚ David Jaffe‚ and W. Curtis Banks. The test subjects were young male college students that were chosen from 75 volunteers. The volunteers had replied to an ad in the paper and were
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Enzyme kinetics Purpose: The goal of this investigation was to measure the amounts of products made and see the different elements that that affect the rate of breakdown of p-Nitro phenol in the absence or presence of cellobiase….. Methods: Activity #1 The materials used for this activity are as follows: 1.5 mM substrate‚ enzyme‚ Stop solution‚ buffer‚ DPTPs‚ 15 ml conical tubes‚ cuvettes‚ marker‚ beaker‚ distilled water‚ spectrophotometer‚ stop watch. First four 15 ml conical tubes
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to certain scientific experiments‚ thought experiments also involve objects that are not found anywhere in nature. As mentioned earlier in this paper‚ genetically identical mice‚ which were used in an experiment to test whether or not a certain chemical caused lung cancer‚ are not found anywhere in nature — the genetically identical mice are a product of science. In this example‚ the elements of the experiment (the mice) were unnatural‚ yet the conclusion of the experiment yielded significant‚ real-world
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Ashley Perez Biology 124 September 15‚ 2013 Discussion Paper In the experiment of Mr. Miller‚ I understand that he sealed in certain elements that stimulated the conditions that he thought were presented in the beginning of earth’s time and tested the chemicals that would be there a few days later. Miller predicted that prehistoric earth had certain chemical reactions that made organic compounds from inorganic base. The experiment used water‚ methane‚ ammonia‚ and hydrogen. The chemicals were
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so the skeletal muscle cells are supplied with more oxygen and respiratory substrates used to generate energy in respiration where it is needed. A drug that increases heart rate is called a positive chronotrope‚ and this is demonstrated in this experiment when adrenaline is used to increase heart rate in Daphnia. One of the ways adrenaline increases heart rate is through the action of what is known as a ’second messenger ’ or ’transduction component ’‚ in this case it is a chemical made in the
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called a particle theory. The experiment of Brownian motion in a smoke cell is a classic experiment that gives strong circumstantial evidence for the particulate nature of air. Materials: ✓ Smoke cell‚ incorporating a light source and lens (Whitley Bay pattern) ✓ Microscope‚ low power (e.g. x10 objective‚ x 10 eyepieces) and large aperture ✓ Power supply‚ 0 to 12 V dc ✓ Microscope cover-slip ✓ Smoke source (e.g. paper drinking straw) Setting up
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AIMS At the end of the experiment‚ students should be able to synthesise pure aspirin using chemical tests such as esterification and recrystallization independently and to also find out the melting point range of aspirin using melting point determination. INTRODUCTION Aspirin‚ which is also known as acetylsalicylic acid‚ is one of the commonly used and widely found in any drugstore or pharmacy. Its properties make aspirin a well-rounded drug that reduces inflammation and fever and also relieves
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Chem 21 Fall 2009 Experiment 9 — Recrystallization _____________________________________________________________________________ Pre-lab preparation. (1) Read the supplemental material from Zubrick‚ The Organic Chem Lab Survival Manual. (2) Draw the structure of acetanilide and report relevant physical data. Be sure to cite the source of the data. You should be able to figure out what’s relevant by reading the procedure. (3) Find and report the boiling points of the solvents you will be using
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