Experiment 11 Date:31-03-2009 Title:Interpretation of reaction by the Le Chatelier’s principle Objective:To determine the factors that affecting the equilibrium position Introduction Iron(III) ions and thiocyanate ions (NCS-) react in solution to produce thiocyanatoiron(III) (FeNCS2+)‚ a complex ion‚ according to the equation : Fe3+(aq) + NCS-(aq) [pic] FeNCS2+(aq) yellow colourless blood red The colour produced by the complex ion indicates the position
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UNIVERSITY OF THE PHILIPPINES‚ DILIMAN QUEZON CITY‚ PHILIPPINES August 2‚ 2013 ABSTRACT The objective of this experiment is to determine the equilibrium constant‚ denoted Keq‚ for the formation of [Fe(SCN)]2+ complex which is a product of the reaction between the ions Fe3+ and SCN-. In performing this experiment‚ solutions containing FeCl3 and KSCN‚ diluted in HCl‚ were measured for their absorbance using a UV-Vis spectrophotometer. Upon computing for the molar concentrations of the reagents
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suprachiasmatic nucleus (SCN) in the hypothalamus‚ SCN obtains information about light from the eye via the optic nerve‚ happens even when eyes are shut‚ as light penetrates the eyelids. If endogenous clock is running slowly‚ morning light automatically shifts the clock ahead‚ making the rhythm correct with the world outside again. SCN- pair of structures- one in each hemisphere of the brain‚ and each of these is divided into a ventral and dorsal SCN. Albus found that the ventral SCN is relatively quickly
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Chemistry 12 Santa Monica College Determination of Kc for a Complex Ion Formation Objectives • • Find the value of the equilibrium constant for formation of FeSCN2+ by using the visible light absorption of the complex ion. Confirm the stoichiometry of the reaction. Background In the study of chemical reactions‚ chemistry students first study reactions that go to completion. Inherent in these familiar problems—such as calculation of theoretical yield‚ limiting reactant‚ and percent yield—is
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Effects of Restricted Feeding on the Circadian Cycles Most living systems undergo circadian rhythms‚ an internal clock that regulates bodily functions within roughly a 24-hour cycle. The suprachiasmatic nucleus (SCN) clock‚ a type of peripheral and oscillator clock‚ is the controlling center of circadian rhythms in living organisms. Circadian rhythm abnormalities can lead to potential disruptions in sleep patterns due to multiple factors. Changes in circadian rhythms can be due to both photic and
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evil is when Lady Macbeth is persuasively talking to Macbeth about the crime. “My hands are of your color‚ but I shame to wear a heart so white.” (Act II‚ Scn 2‚ Ln 63-64) Lady Macbeth has provoked Macbeth’s transformation throughout the play by tempting and mocking him to carry out the deeds that he would not have normally committed. While disrespecting his manhood by calling his heart white‚ she has pushed
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without ambition but without the illness that should attend.” (Act I‚ Scn V‚ Ln 18-20). She believed that Macbeth was unable to hide his malicious ambition.
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daydreaming‚ within sleep cycle Circadian cycle / rhythm Sleep-wake cycle. In free running experiments averaged 25hrs. Controlled by a tear drop shaped area in the hypothalamus called The Suprachiasmatic Nucleus (SCN) All other clocks take their cue from SCN. The SCN itself is kept in synch with day-night patterns by a hormone ‘Melatonin’ secreted by the Pineal gland. Insomnia is correlated with and has been treated with low Melatonin levels • Way to test these cycles: Free
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the equilibrium constant for the formation of an iron(III) thiocyanate complex ion (FeSCN2+) from Fe3+ and SCN- . The quantitative preparation of several solutions and subsequent measurement of the solution absorbance using a spectrophotometer are the techniques that will be used in this experiment. The absorbance measurement gives the concentration of FeSCN2+. The concentrations of Fe3+ and SCN- are obtained as the difference between the initial concentration and the concentration consumed by the formation
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solutions on the calibration curve and tracing it to their concentrations. The initial concentrations of Fe3+ and SCN- were found using the M1V1 = M2V2 equation along with the concentration of FeSCN2+ used in the calibration curve. Then using the chart that organizes the initial‚ change‚ and equilibrium concentrations of a specific products and reactions; the concentration of Fe3+ and SCN- was determined. With the concentrations of the products and the reactants the Keq was determined. The concepts
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